XML Example Applicationt: Geogetown Dry Cleaning Services

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1. Start Microsoft Visual Studio
2. Create a Windows Application named GeorgetownDryCleaningServices4
3. In the Solution Explorer, right-click Form1.cs and click Rename
4. Type Central.cs and press Enter
5. Design the form as follows:
    

   Control Name Text Additional Properties GroupBox   Order Identification   Label   &Receipt #:   TextBox txtReceiptNumber 1000 TextAlign: Right Button btnOpen Open   Button btnNewCleaningOrder New Cleaning Order   Label   Customer Name:   TextBox txtCustomerName     Label   Customer Phone:   MaskedTextBox txtCustomerPhone   Mask: (999) 000-0000 Label   Date Left:   DateTimePicker dtpDateLeft     Label   Time Left:   DateTimePicker dtpTimeLeft   Format: Time Label   Date Expected:   DateTimePicker dtpDateExpected     Label   Time Expected:   DateTimePicker dtpTimeExpected   Format: Time Label   Order &Status:   ComboBox cbxOrderStatus     Label   D&ate Picked Up:   DateTimePicker dtpDatePickedUp     Label   Time Pic&kep Up:   DateTimePicker dtpTimePickedUp     GroupBox   Order Processing   Label   Item Type   Label   Unit Price   Label   Qty   Label   Sub Total   Label   Shirts   TextBox txtShirtsUnitPrice 1.25 TextAlign: Right TextBox txtShirtsQuantity 0 TextAlign: Right TextBox txtShirtsSubTotal 0.00 TextAlign: Right Label   Pants   TextBox txtPantsUnitPrice 1.95 TextAlign: Right TextBox txtPantsQuantity   TextAlign: Right TextBox txtPantsSubTotal 0.00 TextAlign: Right ComboBox cbxItem1Name None Items: None Women Suit Dress Regular Skirt Skirt With Hook Men's Suit 2Pc Men's Suit 3Pc Sweaters Silk Shirt Tie Coat Jacket Swede TextBox txtItem1UnitPrice 0.00 TextAlign: Right TextBox txtItem1Quantity 0 TextAlign: Right TextBox txtItem1SubTotal 0.00 TextAlign: Right ComboBox cbxItem2Name None Items: None Women Suit Dress Regular Skirt Skirt With Hook Men's Suit 2Pc Men's Suit 3Pc Sweaters Silk Shirt Tie Coat Jacket Swede TextBox txtItem2UnitPrice 0.00 TextAlign: Right TextBox txtItem2Quantity 0 TextAlign: Right TextBox txtItem2SubTotal 0.00 TextAlign: Right ComboBox cbxItem3Name None Items: None Women Suit Dress Regular Skirt Skirt With Hook Men's Suit 2Pc Men's Suit 3Pc Sweaters Silk Shirt Tie Coat Jacket Swede TextBox txtItem3UnitPrice 0.00 TextAlign: Right TextBox txtItem3Quantity 0 TextAlign: Right TextBox txtItem3SubTotal 0.00 TextAlign: Right ComboBox cbxItem4Name None Items: None Women Suit Dress Regular Skirt Skirt With Hook Men's Suit 2Pc Men's Suit 3Pc Sweaters Silk Shirt Tie Coat Jacket Swede TextBox txtItem4UnitPrice 0.00 TextAlign: Right TextBox txtItem4Quantity 0 TextAlign: Right TextBox txtItem4SubTotal 0.00 TextAlign: Right GroupBox   Order Summary   Label   Cleaning Total:   TextBox txtCleaningTotal 0.00 TextAlign: Right Label   Tax Rate:   TextBox txtTaxRate 7.75 TextAlign: Right Label   %   Label   Tax Amount:   TextBox txtTaxAmount 0.00 TextAlign: Right Label   Net Total:   TextBox txtNetPrice 0.00 TextAlign: Right Button btnPrint Print...   Button btnPrintPreview Print Preview...   Button btnClose Close

6. Double-click the Time Left control and implement its ValueChanged event as follows:
   

   private void dtpTimeLeft_ValueChanged(object sender, EventArgs e)
   {
       DateTime dateLeft = this.dtpDateLeft.Value;
       DateTime timeLeft = this.dtpTimeLeft.Value;
   
       DateTime time9AM = new DateTime(timeLeft.Year, timeLeft.Month,
                                       timeLeft.Day, 9, 0, 0);
   
       // If the customer leaves clothes before 9AM...
       if (timeLeft <= time9AM)
       {
           // ... then they should be ready the same day after 5PM
           this.dtpDateExpected.Value = dateLeft;
           this.dtpTimeExpected.Value = new DateTime(dateLeft.Year,
                                                     dateLeft.Month,
   					dateLeft.Day, 17, 0, 0);
       }
       else
       {
           // If the clothes were left after 9AM,
           // then they will be available
   	// the following business morning at 8AM
           // If the following day is Sunday,
           // then they will be ready the following Monday
           if (dateLeft.DayOfWeek == DayOfWeek.Saturday)
           {
               dtpDateExpected.Value = dateLeft.AddDays(2.00D);
               dtpTimeExpected.Value = new DateTime(dateLeft.Year,
                                                    dateLeft.Month,
   					dateLeft.Day + 2, 8, 0, 0);
           }
           else
           {
               dtpDateExpected.Value = new DateTime(dateLeft.Year,
                                                    dateLeft.Month,
   						 dateLeft.Day + 1);
               dtpTimeExpected.Value = new DateTime(dateLeft.Year,
                                                    dateLeft.Month,
   					dateLeft.Day + 1, 8, 0, 0);
           }
       }
   }

7. Return to the form  
8. From the Printing section of the Toolbox, click PrintDocument and click the form
9. While the new control is still selected, in the Properties window, click the Properties button, click (Name), type docPrint and press Enter
10. Under the form, double-click docPrint and implement its event as follows:
    

    private void docPrint_PrintPage(object sender, 
    	System.Drawing.Printing.PrintPageEventArgs e)
    {
        e.Graphics.DrawLine(new Pen(Color.Black, 2), 60, 90, 720, 90);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 60, 93, 720, 93);
    
        string strDisplay = "Georgetown Cleaning Services";
        System.Drawing.Font fntString = new Font("Times New Roman", 28,
                    FontStyle.Bold);
        e.Graphics.DrawString(strDisplay, fntString,
                    Brushes.Black, 120, 100);
    
        strDisplay = "Customer Cleaning Order";
        fntString = new System.Drawing.Font("Times New Roman", 18,
                    FontStyle.Bold);
        e.Graphics.DrawString(strDisplay, fntString,
                    Brushes.Black, 220, 150);
    
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 60, 184, 720, 184);
        e.Graphics.DrawLine(new Pen(Color.Black, 2), 60, 188, 720, 188);
    
        fntString = new System.Drawing.Font("Times New Roman", 12,
                    FontStyle.Bold);
        e.Graphics.DrawString("", fntString,
                    Brushes.Black, 80, 200);
    
        fntString = new System.Drawing.Font("Times New Roman", 12,
                    FontStyle.Bold);
        e.Graphics.DrawString("Customer Identification:  ", fntString,
                    Brushes.Black, 100, 220);
        fntString = new System.Drawing.Font("Times New Roman", 12,
                    FontStyle.Regular);
        e.Graphics.DrawString(txtCustomerName.Text + "  -  " +
                                      txtCustomerPhone.Text, fntString,
                                      Brushes.Black, 300, 220); ;
    
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 240, 700, 240);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString("Date Left:        ", fntString,
                                      Brushes.Black, 100, 260);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
    
        e.Graphics.DrawString(dtpDateLeft.Value.ToString("D"), fntString,
                                      Brushes.Black, 300, 260);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 280, 700, 280);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString("Time Left: ", fntString,
                                      Brushes.Black, 500, 260);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(dtpTimeLeft.Value.ToString("t"), fntString,
                                      Brushes.Black, 620, 260);
    
        fntString = new System.Drawing.Font("Times New Roman",
    					12, FontStyle.Bold);
        e.Graphics.DrawString("Date Expected:    ", fntString,
                    Brushes.Black, 100, 300);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(dtpDateExpected.Value.ToString("D"),
    			  fntString, Brushes.Black, 300, 300);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString("Time Expected: ", fntString,
                                      Brushes.Black, 500, 300);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(dtpTimeExpected.Value.ToString("t"),
    			  fntString, Brushes.Black, 620, 300);
    
        e.Graphics.DrawLine(new Pen(Color.Black, 2), 100, 320, 700, 320);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString("Item Type",
                                      fntString, Brushes.Black, 140, 350);
        e.Graphics.DrawString("Unit Price",
                                      fntString, Brushes.Black, 300, 350);
        e.Graphics.DrawString("Quantity",
                                      fntString, Brushes.Black, 405, 350);
        e.Graphics.DrawString("Sub-Total",
                                      fntString, Brushes.Black, 500, 350);
    
        e.Graphics.DrawLine(new Pen(Color.Black, 2), 140, 370, 640, 370);
    
        StringFormat fmtString = new StringFormat();
        fmtString.Alignment = StringAlignment.Far;
    
        e.Graphics.DrawString("Shirts",
                                      fntString, Brushes.Black, 150, 380);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(txtUnitPriceShirts.Text, fntString,
                    Brushes.Black, 350, 380, fmtString);
        e.Graphics.DrawString(txtQuantityShirts.Text, fntString,
                    Brushes.Black, 440, 380, fmtString);
        e.Graphics.DrawString(txtSubTotalShirts.Text, fntString,
                    Brushes.Black, 550, 380, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 140, 400, 640, 400);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString("Pants",
                                      fntString, Brushes.Black, 150, 410);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(txtUnitPricePants.Text, fntString,
                    Brushes.Black, 350, 410, fmtString);
        e.Graphics.DrawString(txtQuantityPants.Text, fntString,
                    Brushes.Black, 440, 410, fmtString);
        e.Graphics.DrawString(txtSubTotalPants.Text, fntString,
                    Brushes.Black, 550, 410, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 140, 430, 640, 430);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString(cbxItem1.Text,
                                      fntString, Brushes.Black, 150, 440);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(txtUnitPriceItem1.Text, fntString,
                    Brushes.Black, 350, 440, fmtString);
        e.Graphics.DrawString(txtQuantityItem1.Text, fntString,
                    Brushes.Black, 440, 440, fmtString);
        e.Graphics.DrawString(txtSubTotalItem1.Text, fntString,
                    Brushes.Black, 550, 440, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 140, 460, 640, 460);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString(cbxItem2.Text,
                                      fntString, Brushes.Black, 150, 470);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(txtUnitPriceItem2.Text, fntString,
                    Brushes.Black, 350, 470, fmtString);
        e.Graphics.DrawString(txtQuantityItem2.Text, fntString,
                    Brushes.Black, 440, 470, fmtString);
        e.Graphics.DrawString(txtSubTotalItem2.Text, fntString,
                    Brushes.Black, 550, 470, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 140, 490, 640, 490);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString(cbxItem3.Text,
                                      fntString, Brushes.Black, 150, 500);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(txtUnitPriceItem3.Text, fntString,
                    Brushes.Black, 350, 500, fmtString);
        e.Graphics.DrawString(txtQuantityItem3.Text, fntString,
                    Brushes.Black, 440, 500, fmtString);
        e.Graphics.DrawString(txtSubTotalItem3.Text, fntString,
                    Brushes.Black, 550, 500, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1), 140, 520, 640, 520);
    
        fntString = new Font("Times New Roman", 12, FontStyle.Bold);
        e.Graphics.DrawString(cbxItem4.Text,
                    fntString, Brushes.Black, 150, 530);
        fntString = new Font("Times New Roman", 12, FontStyle.Regular);
        e.Graphics.DrawString(txtUnitPriceItem4.Text, fntString,
                    Brushes.Black, 350, 530, fmtString);
        e.Graphics.DrawString(txtQuantityItem4.Text, fntString,
                    Brushes.Black, 440, 530, fmtString);
        e.Graphics.DrawString(txtSubTotalItem4.Text, fntString,
                    Brushes.Black, 550, 530, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 2), 140, 550, 640, 550);
    
        fntString = new System.Drawing.Font("Times New Roman", 12,
    					FontStyle.Bold);
        e.Graphics.DrawString("Order Summary", fntString,
                              Brushes.Black, 260, 600);
        e.Graphics.DrawLine(new Pen(Color.Black, 2), 220, 620, 560, 620);
    
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Bold);
        e.Graphics.DrawString("Cleaning Total:", fntString,
                              Brushes.Black, 260, 630);
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Regular);
        e.Graphics.DrawString(txtCleaningTotal.Text, fntString,
                              Brushes.Black, 440, 630, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1),
    			220, 650, 520, 650);
    
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Bold);
        e.Graphics.DrawString("Tax Rate:", fntString,
                              Brushes.Black, 260, 660);
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Regular);
        e.Graphics.DrawString(txtTaxRate.Text, fntString,
                              Brushes.Black, 440, 660, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1),
    			220, 680, 520, 680);
    
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Bold);
        e.Graphics.DrawString("Tax Amount:", fntString,
                              Brushes.Black, 260, 690);
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Regular);
        e.Graphics.DrawString(txtTaxAmount.Text, fntString,
                    	  Brushes.Black, 440, 690, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 1),
    			220, 710, 520, 710);
    
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Bold);
        e.Graphics.DrawString("Net Price:", fntString,
                    Brushes.Black, 260, 720);
        fntString = new System.Drawing.Font("Times New Roman",
    					10, FontStyle.Regular);
        e.Graphics.DrawString(txtNetPrice.Text, fntString,
                    Brushes.Black, 440, 720, fmtString);
        e.Graphics.DrawLine(new Pen(Color.Black, 2),
    			200, 740, 560, 740);
    }

11. Return to the form
12. From the Printing section of the Toolbox, click PrintDialog and click the form
13. In the Properties window, change its Name to dlgPrint
14. Still in the Properties windows, set its Document property to docPrint
15. On the main menu of the form, click File and double-click Print
16. Implement the event as follows:
    

    private void mnuFilePrint_Click(object sender, EventArgs e)
    {
        if (dlgPrint.ShowDialog() == DialogResult.OK)
            docPrint.Print();
    }

17. Return to the form
18. From the Printing section of the Toolbox, click PrintPreviewDialog and click the form
19. In the Properties window, change its Name to dlgPrintPreview
20. Still in the Properties windows, set its Document property to docPrint
21. On the main menu of the form, click File and double-click Print Preview
22. Implement the event as follows:
    

    private void mnuFilePrintPreview_Click(object sender, EventArgs e)
    {
        dlgPrintPreview.ShowDialog();
    }

1. On the form, double-click the New Cleaning Order button and implement its event as follows:
   

   private void btnNewCleaningOrder_Click(object sender, EventArgs e)
   {
       int ReceiptNumber = 1000;
       XmlDocument docCleaningOrders = new XmlDocument();
       Directory.CreateDirectory(@"C:\Georgetown Cleaning Services");
       string Filename =
                   @"C:\Georgetown Cleaning Services\cleaningorders.xml";
   
       // If some payments were previously made
       if (File.Exists(Filename))
       {
           // Open the payments.xml file
           docCleaningOrders.Load(Filename);
   
           // Locate the root element
           XmlElement elmCleaningOrder =
                       docCleaningOrders.DocumentElement;
           // Get a list of the child nodes
           XmlNodeList lstCleaningOrders =
                       elmCleaningOrder.ChildNodes;
   
           // Get the last student number
            ReceiptNumber =
                    int.Parse(lstCleaningOrders[lstCleaningOrders.Count
                                               - 1].FirstChild.InnerText);
       }
   
       txtReceiptNumber.Text = (ReceiptNumber + 1).ToString();
   
       txtCustomerName.Text = "";
       txtCustomerPhone.Text = "";
       dtpDateLeft.Value = DateTime.Today;
       dtpTimeLeft.Value = DateTime.Today;
       dtpDateExpected.Value = DateTime.Today;
       dtpTimeExpected.Value = DateTime.Today;
   
       cbxOrderStatus.Text = "Not Yet Ready";
       dtpDatePickedUp.Value = DateTime.Today;
       dtpTimePickedUp.Value = DateTime.Today;
   
       txtShirtsUnitPrice.Text = "1.25";
       txtShirtsQuantity.Text = "0";
       txtShirtsSubTotal.Text = "0.00";
       txtPantsUnitPrice.Text = "1.95";
       txtPantsQuantity.Text = "0";
       txtPantsSubTotal.Text = "0.00";
       cbxItem1Name.Text = "None";
       txtItem1UnitPrice.Text = "0.00";
       txtItem1Quantity.Text = "0";
       txtItem1SubTotal.Text = "0.00";
       cbxItem2Name.Text = "None";
       txtItem2UnitPrice.Text = "0.00";
       txtItem2Quantity.Text = "0";
       txtItem2SubTotal.Text = "0.00";
       cbxItem3Name.Text = "None";
       txtItem3UnitPrice.Text = "0.00";
       txtItem3Quantity.Text = "0";
       txtItem3SubTotal.Text = "0.00";
       cbxItem4Name.Text = "None";
       txtItem4UnitPrice.Text = "0.00";
       txtItem4Quantity.Text = "0";
       txtItem4SubTotal.Text = "0.00";
   
       txtCleaningTotal.Text = "0.00";
       txtTaxRate.Text = "7.75";
       txtTaxAmount.Text = "0.00";
       txtCleaningTotal.Text = "0.00";
   
       txtCustomerName.Focus();
   }

2. Return to the form and double-click an unoccupied area of its body
3. Implement its event as follows:
   

   private void Central_Load(object sender, EventArgs e)
   {
       btnNewCleaningOrder_Click(sender, e);
   }

1. On the form, double-click the Open button and implement the event as follows:
   

   private void btnOpen_Click(object sender, EventArgs e)
   {
       string Filename =
               @"C:\Georgetown Cleaning Services\cleaningorders.xml";
       XmlDocument docCleaningOrders = new XmlDocument();
   
       if( File.Exists(Filename) )
       {
           bool found = false;
           docCleaningOrders.Load(Filename);
           XmlElement elmCleaningOrder =
                       docCleaningOrders.DocumentElement;
           XmlNodeList lstCleaningOrders =
                       elmCleaningOrder.ChildNodes;
   
           for (int i = 0; i < lstCleaningOrders.Count; i++)
           {
               if (lstCleaningOrders[i].FirstChild.InnerText ==
                   txtReceiptNumber.Text)
               {
                   found = true;
   
                   txtCustomerName.Text =
                       lstCleaningOrders[i]["CustomerName"].InnerText;
                   txtCustomerPhone.Text =
                       lstCleaningOrders[i]["CustomerPhone"].InnerText;
                   dtpDateLeft.Value =
                       DateTime.Parse(lstCleaningOrders[i]["DateLeft"].InnerText);
                   dtpTimeLeft.Value =
                       DateTime.Parse(lstCleaningOrders[i]["TimeLeft"].InnerText);
                   dtpDateExpected.Value =
                       DateTime.Parse(lstCleaningOrders[i]["DateExpected"].InnerText);
                   dtpTimeExpected.Value =
                       DateTime.Parse(lstCleaningOrders[i]["TimeExpected"].InnerText);
   
                   cbxOrderStatus.Text =
                       lstCleaningOrders[i]["OrderStatus"].InnerText;
                   dtpDatePickedUp.Value =
                       DateTime.Parse(lstCleaningOrders[i]["DatePickedUp"].InnerText);
                   dtpTimePickedUp.Value =
                       DateTime.Parse(lstCleaningOrders[i]["TimePickedUp"].InnerText);
   
                   txtShirtsUnitPrice.Text =
                               lstCleaningOrders[i]["ShirtsUnitPrice"].InnerText;
                   txtShirtsQuantity.Text =
                               lstCleaningOrders[i]["ShirtsQuantity"].InnerText;
                   txtShirtsSubTotal.Text =
                               lstCleaningOrders[i]["ShirtsSubTotal"].InnerText;
                   txtPantsUnitPrice.Text =
   			    lstCleaningOrders[i]["PantsUnitPrice"].InnerText;
                   txtPantsQuantity.Text =
   			    lstCleaningOrders[i]["PantsQuantity"].InnerText;
                   txtPantsSubTotal.Text =
   		     lstCleaningOrders[i]["PantsSubTotal"].InnerText;
   
                   cbxItem1Name.Text = lstCleaningOrders[i]["Item1Name"].InnerText;
                           txtItem1UnitPrice.Text =
   		lstCleaningOrders[i]["Item1UnitPrice"].InnerText;
                           txtItem1Quantity.Text =
   		lstCleaningOrders[i]["Item1Quantity"].InnerText;
                           txtItem1SubTotal.Text =
   		lstCleaningOrders[i]["Item1SubTotal"].InnerText;
   
                   cbxItem2Name.Text = lstCleaningOrders[i]["Item2Name"].InnerText;
                   txtItem2UnitPrice.Text =
   			    lstCleaningOrders[i]["Item2UnitPrice"].InnerText;
                   txtItem2Quantity.Text =
   			    lstCleaningOrders[i]["Item2Quantity"].InnerText;
                   txtItem2SubTotal.Text =
   			    lstCleaningOrders[i]["Item2SubTotal"].InnerText;
   
                   cbxItem3Name.Text = lstCleaningOrders[i]["Item3Name"].InnerText;
                   txtItem3UnitPrice.Text =
   			    lstCleaningOrders[i]["Item3UnitPrice"].InnerText;
                   txtItem3Quantity.Text =
   			    lstCleaningOrders[i]["Item3Quantity"].InnerText;
                   txtItem3SubTotal.Text =
   			    lstCleaningOrders[i]["Item3SubTotal"].InnerText;
   
                   cbxItem4Name.Text = lstCleaningOrders[i]["Item4Name"].InnerText;
                   txtItem4UnitPrice.Text =
   			    lstCleaningOrders[i]["Item4UnitPrice"].InnerText;
                   txtItem4Quantity.Text =
   			    lstCleaningOrders[i]["Item4Quantity"].InnerText;
                   txtItem4SubTotal.Text =
   			    lstCleaningOrders[i]["Item4SubTotal"].InnerText;
   
                   txtCleaningTotal.Text =
   			    lstCleaningOrders[i]["CleaningTotal"].InnerText;
                   txtTaxRate.Text = lstCleaningOrders[i]["TaxRate"].InnerText;
                   txtTaxAmount.Text = lstCleaningOrders[i]["TaxAmount"].InnerText;
                   txtNetPrice.Text = lstCleaningOrders[i]["NetPrice"].InnerText;
                   break;
               }
           }
   
           if (found == false)
               MessageBox.Show("There is no cleaning order with that receipt number");
       }
       else
           MessageBox.Show("There is no file that holds the list of cleaning orders");
   }
   
   private void SaveCleaningOrder()
   {
       // This variable will be used to know
       // if the receipt number already exists in the file
       bool ReceiptFound = false;
               
       // This variable will be used to know whether we are creating
       // a new cleaning order or if we are only updating
       // an existing cleaning order
       XmlNode ExistingCleaningOrder = null;
               
       int ReceiptNumber = int.Parse(txtReceiptNumber.Text);
       // We will need a reference to the DOM
       XmlDocument docCleaningOrders = new XmlDocument();
       // Here is the XML file that holds the cleaning orders
       string Filename =
                   @"C:\Georgetown Cleaning Services\cleaningorders.xml";
   
       // If there is no receipt number, don't do anything
       if (txtReceiptNumber.Text.Length == 0)
       {
           MessageBox.Show("The cleaning order cannot be created " +
                           "because the receipt number is missing");
           return;
       }
   
       // If the file exists,...
       if (File.Exists(Filename))
       {
           // then open it
           docCleaningOrders.Load(Filename);
           XmlElement elmCleaningOrder = docCleaningOrders.DocumentElement;
           XmlNodeList lstCleaningOrders = elmCleaningOrder.ChildNodes;
   
           for (int i = 0; i < lstCleaningOrders.Count; i++)
           {
               XmlNode node = lstCleaningOrders.Item(i);
   
               if (lstCleaningOrders.Item(i).FirstChild.InnerText ==
                   txtReceiptNumber.Text)
               {
                   ReceiptFound = true;
                   ExistingCleaningOrder = lstCleaningOrders[i];
                   ReceiptNumber =
                       int.Parse(ExistingCleaningOrder["ReceiptNumber"].InnerText);
                   break;
               }
           }
   
           if (ReceiptFound == true)
           {
               ExistingCleaningOrder["CustomerName"].InnerText =
                           txtCustomerName.Text;
               ExistingCleaningOrder["CustomerPhone"].InnerText =
                           txtCustomerPhone.Text;
   
               ExistingCleaningOrder["DateLeft"].InnerText =
                           dtpDateLeft.Value.ToString("d");
               ExistingCleaningOrder["TimeLeft"].InnerText =
                           dtpTimeLeft.Value.ToString("t");
               ExistingCleaningOrder["DateExpected"].InnerText =
                           dtpDateExpected.Value.ToString("d");
                       ExistingCleaningOrder["TimeExpected"].InnerText =
                           dtpTimeExpected.Value.ToString("t");
   
                       ExistingCleaningOrder["OrderStatus"].InnerText =
                           cbxOrderStatus.Text;
                       ExistingCleaningOrder["DatePickedUp"].InnerText =
                           dtpDatePickedUp.Value.ToString("d");
                       ExistingCleaningOrder["TimePickedUp"].InnerText =
                           dtpTimePickedUp.Value.ToString("t");
   
                       ExistingCleaningOrder["ShirtsUnitPrice"].InnerText =
                           txtShirtsUnitPrice.Text;
                       ExistingCleaningOrder["ShirtsQuantity"].InnerText =
                           txtShirtsQuantity.Text;
                       ExistingCleaningOrder["ShirtsSubTotal"].InnerText =
                           txtShirtsSubTotal.Text;
   
                       ExistingCleaningOrder["PantsUnitPrice"].InnerText =
                           txtPantsUnitPrice.Text;
                       ExistingCleaningOrder["PantsQuantity"].InnerText =
                           txtPantsQuantity.Text;
                       ExistingCleaningOrder["PantsSubTotal"].InnerText =
                           txtPantsSubTotal.Text;
   
                       ExistingCleaningOrder["Item1Name"].InnerText =
                           cbxItem1Name.Text;
                       ExistingCleaningOrder["Item1UnitPrice"].InnerText =
                           txtItem1UnitPrice.Text;
                       ExistingCleaningOrder["Item1Quantity"].InnerText =
                           txtItem1Quantity.Text;
                       ExistingCleaningOrder["Item1SubTotal"].InnerText =
                           txtItem1SubTotal.Text;
   
                       ExistingCleaningOrder["Item2Name"].InnerText =
                           cbxItem2Name.Text;
                       ExistingCleaningOrder["Item2UnitPrice"].InnerText =
                           txtItem2UnitPrice.Text;
                       ExistingCleaningOrder["Item2Quantity"].InnerText =
                           txtItem2Quantity.Text;
                       ExistingCleaningOrder["Item2SubTotal"].InnerText =
                           txtItem2SubTotal.Text;
   
                       ExistingCleaningOrder["Item3Name"].InnerText =
                           cbxItem3Name.Text;
                       ExistingCleaningOrder["Item3UnitPrice"].InnerText =
                           txtItem3UnitPrice.Text;
                       ExistingCleaningOrder["Item3Quantity"].InnerText =
                           txtItem3Quantity.Text;
                       ExistingCleaningOrder["Item3SubTotal"].InnerText =
                           txtItem3SubTotal.Text;
   
                       ExistingCleaningOrder["Item4Name"].InnerText =
                           cbxItem4Name.Text;
                       ExistingCleaningOrder["Item4UnitPrice"].InnerText =
                           txtItem4UnitPrice.Text;
                       ExistingCleaningOrder["Item4Quantity"].InnerText =
                           txtItem4Quantity.Text;
                       ExistingCleaningOrder["Item4SubTotal"].InnerText =
                           txtItem4SubTotal.Text;
   
                       ExistingCleaningOrder["CleaningTotal"].InnerText =
                           txtCleaningTotal.Text;
                       ExistingCleaningOrder["TaxRate"].InnerText =
                           txtTaxRate.Text;
                       ExistingCleaningOrder["TaxAmount"].InnerText =
                           txtTaxAmount.Text;
                       ExistingCleaningOrder["NetPrice"].InnerText =
                           txtNetPrice.Text;
                   }
                   else // The receipt number was not found. So, create a new cleaning order
                   {
                       XmlElement nodRoot = docCleaningOrders.DocumentElement;
                       XmlElement elmXML =
                           docCleaningOrders.CreateElement("CleaningOrder");
   
                       string strNewCleaningOrder =
                           "<ReceiptNumber>" + txtReceiptNumber.Text +
                           "</ReceiptNumber>" + "<CustomerName>" +
                           txtCustomerName.Text + "</CustomerName>" +
                           "<CustomerPhone>" + txtCustomerPhone.Text +
                           "</CustomerPhone>" + "<DateLeft>" +
                           dtpDateLeft.Value.ToString("d") + "</DateLeft>" +
                           "<TimeLeft>" + dtpTimeLeft.Value.ToString("t") +
                           "</TimeLeft>" + "<DateExpected>" +
                           dtpDateExpected.Value.ToString("d") +
                           "</DateExpected>" + "<TimeExpected>" +
                           dtpTimeExpected.Value.ToString("t") +
                           "</TimeExpected>" + "<OrderStatus>" +
                           cbxOrderStatus.Text + "</OrderStatus>" +
                           "<DatePickedUp>" + dtpDatePickedUp.Value.ToString("d") +
                           "</DatePickedUp>" + "<TimePickedUp>" +
                           dtpTimePickedUp.Value.ToString("t") +
                           "</TimePickedUp>" + "<ShirtsUnitPrice>" +
                           txtShirtsUnitPrice.Text + "</ShirtsUnitPrice>" +
                           "<ShirtsQuantity>" + txtShirtsQuantity.Text +
                           "</ShirtsQuantity>" + "<ShirtsSubTotal>" +
                           txtShirtsSubTotal.Text + "</ShirtsSubTotal>" +
                           "<PantsUnitPrice>" + txtPantsUnitPrice.Text +
                           "</PantsUnitPrice>" + "<PantsQuantity>" +
                           txtPantsQuantity.Text + "</PantsQuantity>" +
                           "<PantsSubTotal>" + txtPantsSubTotal.Text +
                           "</PantsSubTotal>" + "<Item1Name>" +
                           cbxItem1Name.Text + "</Item1Name>" +
                           "<Item1UnitPrice>" + txtItem1UnitPrice.Text +
                           "</Item1UnitPrice>" + "<Item1Quantity>" +
                           txtItem1Quantity.Text + "</Item1Quantity>" +
                           "<Item1SubTotal>" + txtItem1SubTotal.Text +
                           "</Item1SubTotal>" + "<Item2Name>" +
                           cbxItem2Name.Text + "</Item2Name>" +
                           "<Item2UnitPrice>" + txtItem2UnitPrice.Text +
                           "</Item2UnitPrice>" + "<Item2Quantity>" +
                           txtItem2Quantity.Text + "</Item2Quantity>" +
                           "<Item2SubTotal>" + txtItem2SubTotal.Text +
                           "</Item2SubTotal>" + "<Item3Name>" +
                           cbxItem3Name.Text + "</Item3Name>" +
                           "<Item3UnitPrice>" + txtItem3UnitPrice.Text +
                           "</Item3UnitPrice>" + "<Item3Quantity>" +
                           txtItem3Quantity.Text + "</Item3Quantity>" +
                           "<Item3SubTotal>" + txtItem3SubTotal.Text +
                           "</Item3SubTotal>" + "<Item4Name>" +
                           cbxItem4Name.Text + "</Item4Name>" +
                           "<Item4UnitPrice>" + txtItem4UnitPrice.Text +
                           "</Item4UnitPrice>" + "<Item4Quantity>" +
                           txtItem4Quantity.Text + "</Item4Quantity>" +
                           "<Item4SubTotal>" + txtItem4SubTotal.Text +
                           "</Item4SubTotal>" + "<CleaningTotal>" +
                           txtCleaningTotal.Text + "</CleaningTotal>" +
                           "<TaxRate>" + txtTaxRate.Text + "</TaxRate>" +
                           "<TaxAmount>" + txtTaxAmount.Text + "</TaxAmount>" +
                           "<NetPrice>" + txtNetPrice.Text + "</NetPrice>";
                       
                       elmXML.InnerXml = strNewCleaningOrder;
                       docCleaningOrders.DocumentElement.AppendChild(elmXML);
                   }
   
                   // docCleaningOrders.Save(Filename);
               }
               // If there is no such a file, prepare to create it
               else //if (!File.Exists(Filename))
               {
                   docCleaningOrders.LoadXml("<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
                                             "<CleaningOrders></CleaningOrders>");
   
                   XmlElement nodRoot = docCleaningOrders.DocumentElement;
                   XmlElement elmXML = docCleaningOrders.CreateElement("CleaningOrder");
                   string strNewCleaningOrder =
                           "<ReceiptNumber>" + txtReceiptNumber.Text +
                           "</ReceiptNumber>" + "<CustomerName>" +
                           txtCustomerName.Text + "</CustomerName>" +
                           "<CustomerPhone>" + txtCustomerPhone.Text +
                           "</CustomerPhone>" + "<DateLeft>" +
                           dtpDateLeft.Value.ToString("d") + "</DateLeft>" +
                           "<TimeLeft>" + dtpTimeLeft.Value.ToString("t") +
                           "</TimeLeft>" + "<DateExpected>" +
                           dtpDateExpected.Value.ToString("d") +
                           "</DateExpected>" + "<TimeExpected>" +
                           dtpTimeExpected.Value.ToString("t") +
                           "</TimeExpected>" + "<OrderStatus>" +
                           cbxOrderStatus.Text + "</OrderStatus>" +
                           "<DatePickedUp>" + dtpDatePickedUp.Value.ToString("d") +
                           "</DatePickedUp>" + "<TimePickedUp>" +
                           dtpTimePickedUp.Value.ToString("t") +
                           "</TimePickedUp>" + "<ShirtsUnitPrice>" +
                           txtShirtsUnitPrice.Text + "</ShirtsUnitPrice>" +
                           "<ShirtsQuantity>" + txtShirtsQuantity.Text +
                           "</ShirtsQuantity>" + "<ShirtsSubTotal>" +
                           txtShirtsSubTotal.Text + "</ShirtsSubTotal>" +
                           "<PantsUnitPrice>" + txtPantsUnitPrice.Text +
                           "</PantsUnitPrice>" + "<PantsQuantity>" +
                           txtPantsQuantity.Text + "</PantsQuantity>" +
                           "<PantsSubTotal>" + txtPantsSubTotal.Text +
                           "</PantsSubTotal>" + "<Item1Name>" +
                           cbxItem1Name.Text + "</Item1Name>" +
                           "<Item1UnitPrice>" + txtItem1UnitPrice.Text +
                           "</Item1UnitPrice>" + "<Item1Quantity>" +
                           txtItem1Quantity.Text + "</Item1Quantity>" +
                           "<Item1SubTotal>" + txtItem1SubTotal.Text +
                           "</Item1SubTotal>" + "<Item2Name>" +
                           cbxItem2Name.Text + "</Item2Name>" +
                           "<Item2UnitPrice>" + txtItem2UnitPrice.Text +
                           "</Item2UnitPrice>" + "<Item2Quantity>" +
                           txtItem2Quantity.Text + "</Item2Quantity>" +
                           "<Item2SubTotal>" + txtItem2SubTotal.Text +
                           "</Item2SubTotal>" + "<Item3Name>" +
                           cbxItem3Name.Text + "</Item3Name>" +
                           "<Item3UnitPrice>" + txtItem3UnitPrice.Text +
                           "</Item3UnitPrice>" + "<Item3Quantity>" +
                   txtItem3Quantity.Text + "</Item3Quantity>" +
                   "<Item3SubTotal>" + txtItem3SubTotal.Text +
                   "</Item3SubTotal>" + "<Item4Name>" +
                   cbxItem4Name.Text + "</Item4Name>" +
                   "<Item4UnitPrice>" + txtItem4UnitPrice.Text +
                   "</Item4UnitPrice>" + "<Item4Quantity>" +
                   txtItem4Quantity.Text + "</Item4Quantity>" +
                   "<Item4SubTotal>" + txtItem4SubTotal.Text +
                   "</Item4SubTotal>" + "<CleaningTotal>" +
                   txtCleaningTotal.Text + "</CleaningTotal>" +
                   "<TaxRate>" + txtTaxRate.Text + "</TaxRate>" +
                   "<TaxAmount>" + txtTaxAmount.Text + "</TaxAmount>" +
                   "<NetPrice>" + txtNetPrice.Text + "</NetPrice>";
   
           elmXML.InnerXml = strNewCleaningOrder;
           docCleaningOrders.DocumentElement.AppendChild(elmXML);
       }
   
       docCleaningOrders.Save(Filename);
   }

2. Return to the form and click the unit price text box that corresponds to the pants
3. Press and hold Shift
4. Click the unit price text boxes for item 1, item 2, item 3, and item 4
5. Click each text box under the Qty label
6. Click the Tax Rate text box
7. Release Shift
8. In the Events section of the Properties window, double-click Leave and implement the event as follows:
   

   private void txtShirtsUnitPrice_Leave(object sender, EventArgs e)
   {
       double unitPriceShirts = 0.00, unitPricePants = 0.00,
              unitPriceItem1 = 0.00, unitPriceItem2 = 0.00,
              unitPriceItem3 = 0.00, unitPriceItem4 = 0.00;
              double subTotalShirts = 0.00, subTotalPants = 0.00,
              subTotalItem1 = 0.00, subTotalItem2 = 0.00,
              subTotalItem3 = 0.00, subTotalItem4 = 0.00;
       int qtyShirts = 1, qtyPants = 1, qtyItem1 = 1,
           qtyItem2 = 1, qtyItem3 = 1, qtyItem4 = 4;
       double cleaningTotal = 0.00, taxRate = 0.00,
              taxAmount = 0.00, netPrice = 0.00;
   
       // Retrieve the unit price of this item
       // Just in case the user types an invalid value,
       // we are using a try...catch
       try
       {
           unitPriceShirts = double.Parse(txtShirtsUnitPrice.Text);
       }
       catch (FormatException)
       {
           MessageBox.Show("The value you entered for the price of " +
                           "shirts is not valid" +
                           "\nPlease try again");
           return;
       }
   
       // Retrieve the number of this item
       // Just in case the user types an invalid value,
       // we are using a try...catch
       try
       {
           qtyShirts = int.Parse(txtShirtsQuantity.Text);
       }
       catch (FormatException)
       {
           MessageBox.Show("The value you entered for the number of " +
                           "shirts is not valid" +
                           "\nPlease try again");
           return;
       }
   
               try
               {
                   unitPricePants = double.Parse(txtPantsUnitPrice.Text);
               }
               catch (FormatException)
               {
                   MessageBox.Show("The value you entered for the price of " +
                                   "pants is not valid" +
                                   "\nPlease try again");
                   return;
               }
   
               try
               {
                   qtyPants = int.Parse(txtPantsQuantity.Text);
               }
               catch (FormatException)
               {
                   MessageBox.Show("The value you entered for the number of " +
                                   "pants is not valid" +
                                   "\nPlease try again");
                   return;
               }
   
               if ((cbxItem1Name.Text == "None") ||
               (cbxItem1Name.Text == ""))
               {
                   qtyItem1 = 0;
                   unitPriceItem1 = 0.00;
               }
               else
               {
                   try
                   {
                       unitPriceItem1 = double.Parse(txtItem1UnitPrice.Text);
                   }
                   catch (FormatException)
                   {
                 MessageBox.Show("The value you entered for the price is not valid" +
                                       "\nPlease try again");
                       return;
                   }
   
                   try
                   {
                       qtyItem1 = int.Parse(txtItem1Quantity.Text);
                   }
                   catch (FormatException)
                   {
                       MessageBox.Show("The value you entered is not valid" +
                                       "\nPlease try again");
                       return;
                   }
               }
   
               if ((cbxItem2Name.Text == "None") ||
               (cbxItem2Name.Text == ""))
               {
                   qtyItem2 = 0;
                   unitPriceItem2 = 0.00;
               }
               else
               {
                   try
                   {
                       unitPriceItem2 = double.Parse(txtItem2UnitPrice.Text);
                   }
                   catch (FormatException)
                   {
                       MessageBox.Show("The value you entered for " +
                           "the price is not valid" +
                                       "\nPlease try again");
                       return;
                   }
   
                   try
                   {
                       qtyItem2 = int.Parse(txtItem2Quantity.Text);
                   }
                   catch (FormatException)
                   {
                       MessageBox.Show("The value you entered is not valid" +
                                       "\nPlease try again");
                       return;
                   }
               }
   
               if ((cbxItem3Name.Text == "None") ||
               (cbxItem3Name.Text == ""))
               {
                   qtyItem3 = 0;
                   unitPriceItem3 = 0.00;
               }
               else
               {
                   try
                   {
                       unitPriceItem3 = double.Parse(txtItem3UnitPrice.Text);
                   }
                   catch (FormatException)
                   {
                       MessageBox.Show("The value you entered for the " +
                           "price is not valid" +
                                       "\nPlease try again");
                       return;
                   }
   
                   try
                   {
                       qtyItem3 = int.Parse(txtItem3Quantity.Text);
                   }
                   catch (FormatException)
                   {
                       MessageBox.Show("The value you entered is not valid" +
                                       "\nPlease try again");
                       return;
                   }
               }
   
               if ((cbxItem4Name.Text == "None") || (cbxItem4Name.Text == ""))
               {
                   qtyItem4 = 0;
                   unitPriceItem4 = 0.00;
               }
               else
               {
                   try
                   {
                       unitPriceItem4 = double.Parse(txtItem4UnitPrice.Text);
                   }
                   catch (FormatException)
                   {
               MessageBox.Show("The value you entered for the price is not valid" +
                               "\nPlease try again");
                       return;
                   }
                   try
                   {
                       qtyItem4 = int.Parse(txtItem4Quantity.Text);
                   }
                   catch (FormatException)
                   {
                       MessageBox.Show("The value you entered is not valid" +
                               "\nPlease try again");
                       return;
                   }
               }
   
               // Calculate the sub-total for this item
               subTotalShirts = qtyShirts * unitPriceShirts;
               subTotalPants = qtyPants * unitPricePants;
               subTotalItem1 = qtyItem1 * unitPriceItem1;
               subTotalItem2 = qtyItem2 * unitPriceItem2;
               subTotalItem3 = qtyItem3 * unitPriceItem3;
               subTotalItem4 = qtyItem4 * unitPriceItem4;
   
               // Calculate the total based on sub-totals
               cleaningTotal = subTotalShirts + subTotalPants + subTotalItem1 +
                       subTotalItem2 + subTotalItem3 + subTotalItem4;
   
               taxRate = double.Parse(txtTaxRate.Text);
               // Calculate the amount owed for the taxes
               taxAmount = cleaningTotal * taxRate / 100;
               // Add the tax amount to the total order
               netPrice = cleaningTotal + taxAmount;
   
               // Display the sub-total in the corresponding text box
               txtShirtsSubTotal.Text = subTotalShirts.ToString("F");
               txtPantsSubTotal.Text = subTotalPants.ToString("F");
               txtItem1SubTotal.Text = subTotalItem1.ToString("F");
               txtItem2SubTotal.Text = subTotalItem2.ToString("F");
               txtItem3SubTotal.Text = subTotalItem3.ToString("F");
               txtItem4SubTotal.Text = subTotalItem4.ToString("F");
   
               txtCleaningTotal.Text = cleaningTotal.ToString("F");
               txtTaxAmount.Text = taxAmount.ToString("F");
               txtNetPrice.Text = netPrice.ToString("F");
   
               SaveCleaningOrder();
   }

9. Return to the form and double-click the Order Status combo box
10. Implement the event as follows:
    

    private void cbxOrderStatus_SelectedIndexChanged(object sender, EventArgs e)
    {
        SaveCleaningOrder();
    }

11. Return to the form and double-click the Date Picked Up control
12. Implement the event as follows:
    

    private void dtpDatePickedUp_ValueChanged(object sender, EventArgs e)
    {
        SaveCleaningOrder();
    }

13. Return to the form and double-click the Time Picked Up control
14. Implement the event as follows:
    

    private void dtpTimePickedUp_ValueChanged(object sender, EventArgs e)
    {
        SaveCleaningOrder();
    }

15. Return to the form and double-click the Close button
16. Implement its event as follows:
    

    private void btnClose_Click(object sender, EventArgs e)
    {
        Close();
    }

17. Execute the application
18. Create a cleaning order
19. Click New Cleaning Order and create a few more cleaning orders
20. Close the form and return to your programming environment