XML-Based Application: College Park Auto-Repair

	XML-Based Application: College Park Auto-Repair

Introduction

This application is an example of implementing the data reading capacities of XML. It is a fictitious company that fixes cars.

Practical Learning: Starting the Application

Start Microsoft Visual Studio .NET and create a Windows Forms Application named CollegeParkAutoRepair2
In the Solution Explorer, right-click Form1.cs and click Rename
Type cpar.cs and press Enter
From the Menus & Toolbars section of the Toolbox, click MenuStrip and click the form

Design the menu items as follows:

MenuItem		DropDownItems
Text	Name	Text	Name	Shortcut
&File	mnuFile	&New Repair Order	mnuFileNew	Ctrl+N
		&Open Existing Order...	mnuFileOpen	Ctrl+O
		&Save Current Order	mnuFileSave	Ctrl+S
		Separator
		&Print...	mnuFilePrint	Ctrl+P
		Print Pre&view...	mnuFilePrintPreview
		Separator
		E&xit	mnuFileExit

Design the form as follows:

Control	Name	Text	Other Properties
Group		Order Identification
Label		Customer Name:
TextBox	txtCustomerName
Label		Address
TextBox	txtAddress
Label		City:
TextBox	txtCity
Label		State:
TextBox	txtState
Label		ZIP Code:
TextBox	txtZIPCode		TextAlign: Right
Label		Make / Model:
TextBox	txtMake
TextBox	txtModel
Label		Year:
TextBox	txtCarYear		TextAlign: Right
Label		Problem Description:
TextBox	txtProblem
GroupBox		Parts Used
Label		Part Name
Label		Unit Price
Label		Qty
Label		Sub Total
TextBox	txtPartName1
TextBox	txtUnitPrice1	0.00	TextAlign: Right
TextBox	txtQuantity1	0	TextAlign: Right
TextBox	txtSubTotal1	0.00	TextAlign: Right Enabled: False
TextBox	txtPartName2
TextBox	txtUnitPrice2	0.00	TextAlign: Right
TextBox	txtQuantity2	0	TextAlign: Right
TextBox	txtSubTotal2	0.00	TextAlign: Right Enabled: False
TextBox	txtPartName3
TextBox	txtUnitPrice3	0.00	TextAlign: Right
TextBox	txtQuantity3	0	TextAlign: Right
TextBox	txtSubTotal3	0.00	TextAlign: Right Enabled: False
TextBox	txtPartName4
TextBox	txtUnitPrice4	0.00	TextAlign: Right
TextBox	txtQuantity4	0	TextAlign: Right
TextBox	txtSubTotal4	0.00	TextAlign: Right Enabled: False
TextBox	txtPartName5
TextBox	txtUnitPrice5	0.00	TextAlign: Right
TextBox	txtQuantity5	0	TextAlign: Right
TextBox	txtSubTotal5	0.00	TextAlign: Right Enabled: False
GroupBox		Jobs Performed
Label		Price
TextBox	txtJobPerformed1
TextBox	txtJobPrice1	0.00	TextAlign: Right
TextBox	txtJobPerformed2
TextBox	txtJobPrice2	0.00	TextAlign: Right
TextBox	txtJobPerformed3
TextBox	txtJobPrice3	0.00	TextAlign: Right
TextBox	txtJobPerformed4
TextBox	txtJobPrice4	0.00	TextAlign: Right
TextBox	txtJobPerformed5
TextBox	txtJobPrice5	0.00	TextAlign: Right
GroupBox		Order Summary
Label		Total Parts:
TextBox	txtTotalParts	0.00	TextAlign: Right
Label		Total Labor:
TextBox	txtTotalLabor	0.00	TextAlign: Right
Label		Tax Rate:
TextBox	txtTaxRate	7.75	TextAlign: Right
Label		%
Label		Tax Amount:
TextBox	txtTaxAmount	0.00	TextAlign: Right
Label		Total Order:
TextBox	txtTotalOrder	0.00	TextAlign: Right
Label		Recommendations
TextBox	txtRecommendations		Multiline: True ScrollBars: Vertical

Right-click the form and click View Code

Create a method named Calculate as follows:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml;

namespace CollegeParkAutoRepair2
{
    public partial class Exercise : Form
    {
        public Exercise()
        {
            InitializeComponent();
        }
        
        void Calculate()
        {
            double part1UnitPrice = 0.00, part2UnitPrice = 0.00,
                   part3UnitPrice = 0.00, part4UnitPrice = 0.00,
                   part5UnitPrice = 0.00;
            double part1SubTotal, part2SubTotal, part3SubTotal,
                   part4SubTotal, part5SubTotal, totalParts;
            int part1Quantity = 0, part2Quantity = 0, part3Quantity = 0,
                   part4Quantity = 0, part5Quantity = 0;
            double job1Price = 0.00, job2Price = 0.00, job3Price = 0.00,
                   job4Price = 0.00, job5Price = 0.00;
            double totalLabor;
            double taxRate = 0.00, taxAmount, totalOrder;

            // Don't charge a part unless it is clearly identified
            if (txtPartName1.Text == "")
            {
                txtUnitPrice1.Text = "0.00";
                txtQuantity1.Text = "0";
                txtSubTotal1.Text = "0.00";
                part1UnitPrice = 0.00;
            }
            else
            {
                try
                {
                    part1UnitPrice = double.Parse(txtUnitPrice1.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Unit Price");
                    txtUnitPrice1.Text = "0.00";
                    txtUnitPrice1.Focus();
                }

                try
                {
                    part1Quantity = int.Parse(txtQuantity1.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Quantity");
                    txtQuantity1.Text = "0";
                    txtQuantity1.Focus();
                }
            }

            if (this.txtPartName2.Text == "" )
            {
                txtUnitPrice2.Text = "0.00";
                txtQuantity2.Text = "0";
                txtSubTotal2.Text = "0.00";
                part2UnitPrice = 0.00;
            }
            else
            {
                try
                {
                    part2UnitPrice = double.Parse(txtUnitPrice2.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Unit Price");
                    this.txtUnitPrice2.Text = "0.00";
                    this.txtUnitPrice2.Focus();
                }

                try
                {
                    part2Quantity = int.Parse(txtQuantity2.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Quantity");
                    txtQuantity2.Text = "0";
                    txtQuantity2.Focus();
                }
            }

            if (txtPartName3.Text == "" )
            {
                txtUnitPrice3.Text = "0.00";
                txtQuantity3.Text = "0";
                txtSubTotal3.Text = "0.00";
                part3UnitPrice = 0.00;
            }
            else
            {
                try
                {
                    part3UnitPrice = double.Parse(txtUnitPrice3.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Unit Price");
                    txtUnitPrice3.Text = "0.00";
                    txtUnitPrice3.Focus();
                }

                try
                {
                    part3Quantity = int.Parse(txtQuantity3.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Quantity");
                    txtQuantity3.Text = "0";
                    txtQuantity3.Focus();
                }
            }

            if (txtPartName4.Text == "" )
            {
                txtUnitPrice4.Text = "0.00";
                txtQuantity4.Text = "0";
                txtSubTotal4.Text = "0.00";
                part4UnitPrice = 0.00;
            }
            else
            {
                try
                {
                    part4UnitPrice = double.Parse(txtUnitPrice4.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Unit Price");
                    txtUnitPrice4.Text = "0.00";
                    txtUnitPrice4.Focus();
                }

                try
                {
                    part4Quantity = int.Parse(txtQuantity4.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Quantity");
                    txtQuantity4.Text = "0";
                    txtQuantity4.Focus();
                }
            }

            if (txtPartName5.Text == "" )
            {
                txtUnitPrice5.Text = "0.00";
                txtQuantity5.Text = "0";
                txtSubTotal5.Text = "0.00";
                part5UnitPrice = 0.00;
            }
            else
            {
                try
                {
                    part5UnitPrice = double.Parse(txtUnitPrice5.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Unit Price");
                    txtUnitPrice5.Text = "0.00";
                    txtUnitPrice5.Focus();
                }

                try
                {
                    part5Quantity = int.Parse(txtQuantity5.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Quantity");
                    txtQuantity5.Text = "0";
                    txtQuantity5.Focus();
                }
            }

            // Don't bill the customer for a job that is not specified
            if (txtJobDescription1.Text == "")
            {
                txtJobPrice1.Text = "0.00";
                job1Price = 0.00;
            }
            else
            {
                try
                {
                    job1Price = double.Parse(txtJobPrice1.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Job Price");
                    txtJobPrice1.Text = "0.00";
                    txtJobPrice1.Focus();
                }
            }

            if (txtJobDescription2.Text == "")
            {
                txtJobPrice2.Text = "0.00";
                job2Price = 0.00;
            }
            else
            {
                try
                {
                    job2Price = double.Parse(txtJobPrice2.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Job Price");
                    txtJobPrice2.Text = "0.00";
                    txtJobPrice2.Focus();
                }
            }

            if (txtJobDescription3.Text == "")
            {
                txtJobPrice3.Text = "0.00";
                job3Price = 0.00;
            }
            else
            {
                try
                {
                    job3Price = double.Parse(txtJobPrice3.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Job Price");
                    txtJobPrice3.Text = "0.00";
                    txtJobPrice3.Focus();
                }
            }

            if (txtJobDescription4.Text == "")
            {
                txtJobPrice4.Text = "0.00";
                job4Price = 0.00;
            }
            else
            {
                try
                {
                    job4Price = double.Parse(txtJobPrice4.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Job Price");
                    txtJobPrice4.Text = "0.00";
                    txtJobPrice4.Focus();
                }
            }

            if (txtJobDescription5.Text == "")
            {
                txtJobPrice5.Text = "0.00";
                job5Price = 0.00;
            }
            else
            {
                try
                {
                    job5Price = double.Parse(txtJobPrice5.Text);
                }
                catch (FormatException)
                {
                    MessageBox.Show("Invalid Job Price");
                    txtJobPrice5.Text = "0.00";
                    txtJobPrice5.Focus();
                }
            }

            part1SubTotal = part1UnitPrice * part1Quantity;
            part2SubTotal = part2UnitPrice * part2Quantity;
            part3SubTotal = part3UnitPrice * part3Quantity;
            part4SubTotal = part4UnitPrice * part4Quantity;
            part5SubTotal = part5UnitPrice * part5Quantity;

            txtSubTotal1.Text = part1SubTotal.ToString("F");
            txtSubTotal2.Text = part2SubTotal.ToString("F");
            txtSubTotal3.Text = part3SubTotal.ToString("F");
            txtSubTotal4.Text = part4SubTotal.ToString("F");
            txtSubTotal5.Text = part5SubTotal.ToString("F");

            totalParts = part1SubTotal + part2SubTotal + part3SubTotal +
                    part4SubTotal + part5SubTotal;

            totalLabor = job1Price + job2Price + job3Price +
                            job4Price + job5Price;

            try
            {
                taxRate = double.Parse(txtTaxRate.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid Tax Rate");
                txtTaxRate.Text = "7.75";
                txtTaxRate.Focus();
            }

            double totalPartsAndLabor = totalParts + totalLabor;
            taxAmount = totalPartsAndLabor * taxRate / 100;
            totalOrder = totalPartsAndLabor + taxAmount;

            txtTotalParts.Text = totalParts.ToString("F");
            txtTotalLabor.Text = totalLabor.ToString("F");
            txtTaxAmount.Text = taxAmount.ToString("F");
            txtTotalOrder.Text = totalOrder.ToString("F");
        }
    }
}

Return to the form
On the form, click File and double-click New Repair Order

Implement its Click event as follows:

private void mnuFileNew_Click(object sender, EventArgs e)
{
    this.txtCustomerName.Text = "";
    this.txtAddress.Text = "";
    this.txtCity.Text = "";
    this.txtState.Text = "";
    this.txtZIPCode.Text = "";
    this.txtMake.Text = "";
    this.txtModel.Text = "";
    this.txtCarYear.Text = "";
    this.txtProblem.Text = "";

    this.txtPartName1.Text = "";
    this.txtUnitPrice1.Text = "0.00";
    this.txtQuantity1.Text = "0";
    this.txtSubTotal1.Text = "0.00";
    this.txtPartName2.Text = "";
    this.txtUnitPrice2.Text = "0.00";
    this.txtQuantity2.Text = "0";
    this.txtSubTotal2.Text = "0.00";
    this.txtPartName3.Text = "";
    this.txtUnitPrice3.Text = "0.00";
    this.txtQuantity3.Text = "0";
    this.txtSubTotal3.Text = "0.00";
    this.txtPartName4.Text = "";
    this.txtUnitPrice4.Text = "0.00";
    this.txtQuantity4.Text = "0";
    this.txtSubTotal4.Text = "0.00";
    this.txtPartName5.Text = "";
    this.txtUnitPrice5.Text = "0.00";
    this.txtQuantity5.Text = "0";
    this.txtSubTotal5.Text = "0.00";

    this.txtJobDescription1.Text = "";
    this.txtJobPrice1.Text = "0.00";
    this.txtJobDescription2.Text = "";
    this.txtJobPrice2.Text = "0.00";
    this.txtJobDescription3.Text = "";
    this.txtJobPrice3.Text = "0.00";
    this.txtJobDescription4.Text = "";
    this.txtJobPrice4.Text = "0.00";
    this.txtJobDescription5.Text = "";
    this.txtJobPrice5.Text = "0.00";

    this.txtTotalParts.Text = "0.00";
    this.txtTotalLabor.Text = "0.00";
    this.txtTaxRate.Text = "7.75";
    this.txtTaxAmount.Text = "0.00";
    this.txtTotalOrder.Text = "0.00";

    this.txtRecommendations.Text = "";
    this.txtCustomerName.Focus();
}

Return to the form and click the first text box under Unit Price
In the Properties window, click the Events button and double-click Leave

Call the Calculate() method as follows:

private void txtUnitPrice1_Leave(object sender, EventArgs e)
{
    Calculate();
}

Return to the form
Click each text box under Unit Price and, in the Events section of the Properties Windows, click Leave to select txtUnitPrice1_Leave
Click each text box under Qty and, in the Events section of the Properties Windows, click Leave to select txtUnitPrice1_Leave
Click each text box under Price (in the Jobs Performed section of the form) and, in the Events section of the Properties Windows, click Leave to select txtUnitPrice1_Leave
Click the Tax Rate text box and, in the Events section of the Properties Windows, click Leave to select txtUnitPrice1_Leave
From the Printing section of the Toolbox, click the PrintDocument button and click the form
While the print document control is still selected, in the Properties window, change its name to docPrint
On the bar under the form, double-click docPrint to generate its default event

Implement the PrintPage event as follows:

private void docPrint_PrintPage(object sender,
            System.Drawing.Printing.PrintPageEventArgs e)
{
            e.Graphics.DrawLine(new Pen(Color.Black, 2), 60, 90, 680, 90);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 60, 93, 680, 93);

            string strDisplay = "College Park Auto Repair";
            System.Drawing.Font fntString = new Font("Times New Roman", 28,
                FontStyle.Bold);
            e.Graphics.DrawString(strDisplay, fntString,
                Brushes.Black, 160, 100);

            strDisplay = "Customer Car Repair 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, 680, 184);
            e.Graphics.DrawLine(new Pen(Color.Black, 2), 60, 187, 680, 187);

            fntString = new System.Drawing.Font("Times New Roman", 12,
                FontStyle.Bold);
            e.Graphics.DrawString("Order Identification", fntString,
                Brushes.Black, 80, 200);

            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 250, 640, 250);

            fntString = new System.Drawing.Font("Times New Roman", 10,
                FontStyle.Bold);
            e.Graphics.DrawString("Customer Name:", fntString,
                Brushes.Black, 100, 260);
            fntString = new System.Drawing.Font("Times New Roman", 10,
                FontStyle.Regular);
            e.Graphics.DrawString(txtCustomerName.Text, fntString,
                Brushes.Black, 260, 260); ;

            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 280, 640, 280);

            fntString = new Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Address:", fntString,
                Brushes.Black, 100, 290);
            fntString = new Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtAddress.Text, fntString,
                Brushes.Black, 260, 290); ;

            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 310, 640, 310);

            fntString = new Font("Times New Roman", 10, FontStyle.Regular);
            string strAddress = txtCity.Text.ToString() + ", " +
                                txtState.Text + " " + txtZIPCode.Text;
            e.Graphics.DrawString(strAddress, fntString, Brushes.Black, 260, 320);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 340, 640, 340);

            fntString = new Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Car:", fntString, Brushes.Black, 100, 350);
            fntString = new Font("Times New Roman", 10, FontStyle.Regular);
            string strCar = txtMake.Text + ", " + txtModel.Text +
                            ", " + txtCarYear.Text;
            e.Graphics.DrawString(strCar, fntString, Brushes.Black, 260, 350);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 370, 640, 370);

            fntString = new Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Problem Description:", fntString,
                Brushes.Black, 100, 380);
            fntString = new Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtProblem.Text, fntString,
                                  Brushes.Black,
                                  new RectangleF(260, 380, 420, 380));
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 400, 640, 400);

            fntString = new System.Drawing.Font("Times New Roman", 12, FontStyle.Bold);
            e.Graphics.DrawString("Parts Used", fntString,
                Brushes.Black, 80, 430);

            e.Graphics.DrawLine(new Pen(Color.Black, 2), 80, 450, 680, 450);

            e.Graphics.DrawString("Parts Name", fntString,
                Brushes.Black, 100, 460);
            e.Graphics.DrawString("Unit Price", fntString,
                Brushes.Black, 420, 460);
            e.Graphics.DrawString("Qty", fntString,
                Brushes.Black, 520, 460);
            e.Graphics.DrawString("Sub-Total", fntString,
                Brushes.Black, 562, 460);

            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 480, 640, 480);

            fntString = new Font("Times New Roman", 10, FontStyle.Regular);
            StringFormat fmtString = new StringFormat();
            fmtString.Alignment = StringAlignment.Far;

            e.Graphics.DrawString(txtPartName1.Text, fntString,
                Brushes.Black, 100, 490);
            e.Graphics.DrawString(txtUnitPrice1.Text, fntString,
                Brushes.Black, 480, 490, fmtString);
            e.Graphics.DrawString(txtQuantity1.Text, fntString,
                Brushes.Black, 540, 490, fmtString);
            e.Graphics.DrawString(txtSubTotal1.Text, fntString,
                Brushes.Black, 630, 490, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1),
                100, 510, 640, 510);

            e.Graphics.DrawString(txtPartName2.Text, fntString,
                Brushes.Black, 100, 520);
            e.Graphics.DrawString(txtUnitPrice2.Text, fntString,
                Brushes.Black, 480, 520, fmtString);
            e.Graphics.DrawString(txtQuantity2.Text, fntString,
                Brushes.Black, 540, 520, fmtString);
            e.Graphics.DrawString(txtSubTotal2.Text, fntString,
                Brushes.Black, 630, 520, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 540, 640, 540);

            e.Graphics.DrawString(txtPartName3.Text, fntString,
                Brushes.Black, 100, 550);
            e.Graphics.DrawString(txtUnitPrice3.Text, fntString,
                Brushes.Black, 480, 550, fmtString);
            e.Graphics.DrawString(txtQuantity3.Text, fntString,
                Brushes.Black, 540, 550, fmtString);
            e.Graphics.DrawString(txtSubTotal3.Text, fntString,
                Brushes.Black, 630, 550, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1),
                100, 570, 640, 570);

            e.Graphics.DrawString(txtPartName4.Text, fntString,
                Brushes.Black, 100, 580);
            e.Graphics.DrawString(txtUnitPrice4.Text, fntString,
                Brushes.Black, 480, 580, fmtString);
            e.Graphics.DrawString(txtQuantity4.Text, fntString,
                Brushes.Black, 540, 580, fmtString);
            e.Graphics.DrawString(txtSubTotal4.Text, fntString,
                Brushes.Black, 630, 580, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 600, 640, 600);

            e.Graphics.DrawString(txtPartName5.Text, fntString,
                Brushes.Black, 100, 610);
            e.Graphics.DrawString(txtUnitPrice5.Text, fntString,
                Brushes.Black, 480, 610, fmtString);
            e.Graphics.DrawString(txtQuantity5.Text, fntString,
                Brushes.Black, 540, 610, fmtString);
            e.Graphics.DrawString(txtSubTotal5.Text, fntString,
                Brushes.Black, 630, 610, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 630, 640, 630);

            fntString = new Font("Times New Roman", 12, FontStyle.Bold);
            e.Graphics.DrawString("Jobs Performed", fntString,
                Brushes.Black, 80, 650);
            e.Graphics.DrawLine(new Pen(Color.Black, 2), 80, 670, 680, 670);

            e.Graphics.DrawString("Job Name", fntString, Brushes.Black, 100, 680);
            e.Graphics.DrawString("Price", fntString, Brushes.Black, 562, 680);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 700, 640, 700);

            fntString = new Font("Times New Roman", 10, FontStyle.Regular);

            e.Graphics.DrawString(txtJobDescription1.Text, fntString,
                Brushes.Black, 100, 710);
            e.Graphics.DrawString(txtJobPrice1.Text, fntString,
                Brushes.Black, 600, 710, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 730, 640, 730);

            e.Graphics.DrawString(txtJobDescription2.Text, fntString,
                Brushes.Black, 100, 740);
            e.Graphics.DrawString(txtJobPrice2.Text, fntString,
                Brushes.Black, 600, 740, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 760, 640, 760);

            e.Graphics.DrawString(txtJobDescription3.Text, fntString,
                Brushes.Black, 100, 770);
            e.Graphics.DrawString(txtJobPrice3.Text, fntString,
                Brushes.Black, 600, 770, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 790, 640, 790);

            e.Graphics.DrawString(txtJobDescription4.Text, fntString,
                Brushes.Black, 100, 800);
            e.Graphics.DrawString(txtJobPrice4.Text, fntString,
                Brushes.Black, 600, 800, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 820, 640, 820);

            e.Graphics.DrawString(txtJobDescription5.Text, fntString,
                Brushes.Black, 100, 830);
            e.Graphics.DrawString(txtJobPrice5.Text, fntString,
                Brushes.Black, 600, 830, fmtString);
            e.Graphics.DrawLine(new Pen(Color.Black, 1), 100, 850, 640, 850);

            fntString = new System.Drawing.Font("Times New Roman", 12, FontStyle.Bold);
            e.Graphics.DrawString("Order Summary", fntString,
                Brushes.Black, 80, 870);
            e.Graphics.DrawLine(new Pen(Color.Black, 2), 80, 890, 680, 890);

            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Total Parts:", fntString,
                Brushes.Black, 500, 900);
            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtTotalParts.Text, fntString,
                Brushes.Black, 640, 900, fmtString);

            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Total Labor:", fntString,
                Brushes.Black, 500, 920);
            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtTotalLabor.Text, fntString,
                Brushes.Black, 640, 920, fmtString);

            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Tax Rate:", fntString,
                Brushes.Black, 500, 940);
            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtTaxRate.Text, fntString,
                Brushes.Black, 640, 940, fmtString);

            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Tax Amount:", fntString,
                Brushes.Black, 500, 960);
            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtTaxAmount.Text, fntString,
                Brushes.Black, 640, 960, fmtString);

            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Repair Total:", fntString,
                Brushes.Black, 500, 980);
            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtTotalOrder.Text, fntString,
                Brushes.Black, 640, 980, fmtString);

            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Bold);
            e.Graphics.DrawString("Recommendations:", fntString,
                Brushes.Black, 100, 900);
            fntString = new System.Drawing.Font("Times New Roman", 10, FontStyle.Regular);
            e.Graphics.DrawString(txtRecommendations.Text, fntString,
                Brushes.Black, new RectangleF(100, 920, 350, 280));
}

Return to the form
From the Printing section of the Toolbox, click the PrintDialog button and click the form
While the print control is still selected, in the Properties window, change its Name to dlgPrint
Click Document and select docPrint
On the form, click File and double-click Print

Implement its Click event as follows:

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

Return to the form
From the Printing section of the Toolbox, click PrintPreviewDialog and click the form
In the Properties window, change its (Name) to dlgPrintPreview
Still in the Properties windows, set its Document property to docPrint
On the form, click File and double-click the Print Preview

Implement the event as follows:

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

Save the file

Practical Learning: Creating the Elements of an XML File

From the Dialogs section of the Toolbox, click SaveFileDialog and click the form
Change its properties as follows:
Title: Save Current Repair Order
DefaultExt: xml
Filter: Repair Orders (*.xml)|*.xml|All Files|
Name: dlgSave
On the form, click File and double-click Save Current Order

To create the XML file with the desired elements, implement the event as follows:

private void mnuFileSave_Click(object sender, EventArgs e)
{
    // Just in case, calculate the order now
    Calculate();
    // This number will be used to incrementally
    // create the files by their names
    int iFilename;
    string strFilename;
    
    // If this directory doesn't exist, create it
    // Also, get a reference to this directory for later use
    string strDirectory = @"C:\College Park Auto Repair";
    DirectoryInfo dirInfo =
                Directory.CreateDirectory(strDirectory);

    // Get the list of files, if any, from the above folder
    FileInfo[] fleList = dirInfo.GetFiles("*.xml");

    // If there is no XML file in the directory,
    // then get ready to create the first file
    if (fleList.Length == 0)
    {
        // Create the name of the (initial) file
        iFilename = 1000;
    }
    else // If there was at least one file in the directory
    {
                // Get a reference to the last file
                FileInfo fleLast = fleList[fleList.Length - 1];
                // Get the name of the last file without its extension
                string fwe = Path.GetFileNameWithoutExtension(fleLast.FullName);
                // Get the name of the file
                iFilename = int.Parse(fwe);
            }

            strFilename = strDirectory + "\\" + (iFilename + 1).ToString() + ".xml";
                
            // Get ready to display it in the Save dialog box
            dlgSave.FileName = strFilename;

            // Find out if the user clicked OK after displaying the Save dialog box
            if (dlgSave.ShowDialog() == DialogResult.OK)
            {
                XmlTextWriter wtrRepairOrder = new XmlTextWriter(strFilename,
                    Encoding.UTF8);
                wtrRepairOrder.Formatting = Formatting.Indented;
                wtrRepairOrder.Indentation = 4;

                // Create the contents of the XML file
                // Notice that we are not making an attempt to check the values
                wtrRepairOrder.WriteStartDocument();

                wtrRepairOrder.WriteStartElement("RepairOrders");
                wtrRepairOrder.WriteStartElement("Invoice");

                wtrRepairOrder.WriteElementString("CustomerName", this.txtCustomerName.Text);
                wtrRepairOrder.WriteElementString("Addres", this.txtAddress.Text);
                wtrRepairOrder.WriteElementString("City", this.txtCity.Text);
                wtrRepairOrder.WriteElementString("State", this.txtState.Text);
                wtrRepairOrder.WriteElementString("ZIPCode", this.txtZIPCode.Text);
                wtrRepairOrder.WriteElementString("Make", this.txtMake.Text);
                wtrRepairOrder.WriteElementString("Model", this.txtModel.Text);
                wtrRepairOrder.WriteElementString("CarYear", this.txtCarYear.Text);
                wtrRepairOrder.WriteElementString("ProbDescription", this.txtProblem.Text);
                wtrRepairOrder.WriteElementString("PartName1", this.txtPartName1.Text);
                wtrRepairOrder.WriteElementString("UnitPrice1", this.txtUnitPrice1.Text);
                wtrRepairOrder.WriteElementString("Quantity1", this.txtQuantity1.Text);
                wtrRepairOrder.WriteElementString("SubTotal1", this.txtSubTotal1.Text);
                wtrRepairOrder.WriteElementString("PartName2", this.txtPartName2.Text);
                wtrRepairOrder.WriteElementString("UnitPrice2", this.txtUnitPrice2.Text);
                wtrRepairOrder.WriteElementString("Quantity2", this.txtQuantity2.Text);
                wtrRepairOrder.WriteElementString("SubTotal2", this.txtSubTotal2.Text);
                wtrRepairOrder.WriteElementString("PartName3", this.txtPartName3.Text);
                wtrRepairOrder.WriteElementString("UnitPrice3", this.txtUnitPrice3.Text);
                wtrRepairOrder.WriteElementString("Quantity3", this.txtQuantity3.Text);
                wtrRepairOrder.WriteElementString("SubTotal3", this.txtSubTotal3.Text);
                wtrRepairOrder.WriteElementString("PartName4", this.txtPartName4.Text);
                wtrRepairOrder.WriteElementString("UnitPrice4", this.txtUnitPrice4.Text);
                wtrRepairOrder.WriteElementString("Quantity4", this.txtQuantity4.Text);
                wtrRepairOrder.WriteElementString("SubTotal4", this.txtSubTotal4.Text);
                wtrRepairOrder.WriteElementString("PartName5", this.txtPartName5.Text);
                wtrRepairOrder.WriteElementString("UnitPrice5", this.txtUnitPrice5.Text);
                wtrRepairOrder.WriteElementString("Quantity5", this.txtQuantity5.Text);
                wtrRepairOrder.WriteElementString("SubTotal5", this.txtSubTotal5.Text);
                wtrRepairOrder.WriteElementString("JobDescription1", this.txtJobDescription1.Text);
                wtrRepairOrder.WriteElementString("JobPrice1", this.txtJobPrice1.Text);
                wtrRepairOrder.WriteElementString("JobDescription2", this.txtJobDescription2.Text);
                wtrRepairOrder.WriteElementString("JobPrice2", this.txtJobPrice2.Text);
                wtrRepairOrder.WriteElementString("JobDescription3", this.txtJobDescription3.Text);
                wtrRepairOrder.WriteElementString("JobPrice3", this.txtJobPrice3.Text);
                wtrRepairOrder.WriteElementString("JobDescription4", this.txtJobDescription4.Text);
                wtrRepairOrder.WriteElementString("JobPrice4", this.txtJobPrice4.Text);
                wtrRepairOrder.WriteElementString("JobDescription5", this.txtJobDescription5.Text);
                wtrRepairOrder.WriteElementString("JobPrice5", this.txtJobPrice5.Text);
                wtrRepairOrder.WriteElementString("TotalPart", this.txtTotalParts.Text);
                wtrRepairOrder.WriteElementString("TotalLabor", this.txtTotalLabor.Text);
                wtrRepairOrder.WriteElementString("TaxRate", this.txtTaxRate.Text);
                wtrRepairOrder.WriteElementString("TaxAmount", this.txtTaxAmount.Text);
                wtrRepairOrder.WriteElementString("TotalOrder", this.txtTotalOrder.Text);
                wtrRepairOrder.WriteElementString("Recommendation", this.txtRecommendations.Text);

                wtrRepairOrder.WriteEndElement();
                wtrRepairOrder.WriteEndElement();

                wtrRepairOrder.WriteEndDocument();

                wtrRepairOrder.Flush();
                wtrRepairOrder.Close();
            }
        }

Execute the application to test it
Create a new record and click Calculate Order:
Click File -> Save and OK to Save the file
Click File -> New Repair Order
Create another repair order:
Save it
Close the form and return to your programming environment

Practical Learning: Reading the Elements of an XML File

Display the form.
From the Dialogs section of the Toolbox, click OpenFileDialog and click the form
Change its properties as follows:
Title: Open Existing Repair Order
DefaultExt: xml
Filter: Repair Orders (*.xml)|*.xml|All Files|
Name: dlgOpen
On the form, click File and double-click Open Existing Order

Implement the Click event as follows:

private void mnuFileOpen_Click(object sender, EventArgs e)
{
    XmlTextReader rdrRepairOrder = null;

    try
    {
        if (dlgOpen.ShowDialog() == DialogResult.OK)
        {
            rdrRepairOrder = new XmlTextReader(dlgOpen.FileName);

            // Scan the XML file
            while (rdrRepairOrder.Read())
            {
                // every time you find an element, find out what type it is
                // If you find text, put it in the combo box' list
                if( (XmlNodeType.Element != 0) &&
		    (rdrRepairOrder.Name == "CustomerName") )
                {
                    txtCustomerName.Text = 
			rdrRepairOrder.ReadElementString("CustomerName");
                    txtAddress.Text = rdrRepairOrder.ReadElementString("Addres");
                    txtCity.Text = rdrRepairOrder.ReadElementString("City");
                    txtState.Text = rdrRepairOrder.ReadElementString("State");
                    txtZIPCode.Text = rdrRepairOrder.ReadElementString("ZIPCode");
                    txtMake.Text = rdrRepairOrder.ReadElementString("Make");
                    txtModel.Text = rdrRepairOrder.ReadElementString("Model");
                    txtCarYear.Text = rdrRepairOrder.ReadElementString("CarYear");
                    txtProblem.Text = 
			rdrRepairOrder.ReadElementString("ProbDescription");
                    txtPartName1.Text = rdrRepairOrder.ReadElementString("PartName1");
                    txtUnitPrice1.Text = rdrRepairOrder.ReadElementString("UnitPrice1");
                    txtQuantity1.Text = rdrRepairOrder.ReadElementString("Quantity1");
                    txtSubTotal1.Text = rdrRepairOrder.ReadElementString("SubTotal1");
                    txtPartName2.Text = rdrRepairOrder.ReadElementString("PartName2");
                    txtUnitPrice2.Text = rdrRepairOrder.ReadElementString("UnitPrice2");
                    txtQuantity2.Text = rdrRepairOrder.ReadElementString("Quantity2");
                    txtSubTotal2.Text = rdrRepairOrder.ReadElementString("SubTotal2");
                    txtPartName3.Text = rdrRepairOrder.ReadElementString("PartName3");
                    txtUnitPrice3.Text = rdrRepairOrder.ReadElementString("UnitPrice3");
                    txtQuantity3.Text = rdrRepairOrder.ReadElementString("Quantity3");
                    txtSubTotal3.Text = rdrRepairOrder.ReadElementString("SubTotal3");
                    txtPartName4.Text = rdrRepairOrder.ReadElementString("PartName4");
                    txtUnitPrice4.Text = rdrRepairOrder.ReadElementString("UnitPrice4");
                    txtQuantity4.Text = rdrRepairOrder.ReadElementString("Quantity4");
                    txtSubTotal4.Text = rdrRepairOrder.ReadElementString("SubTotal4");
                    txtPartName5.Text = rdrRepairOrder.ReadElementString("PartName5");
                    txtUnitPrice5.Text = rdrRepairOrder.ReadElementString("UnitPrice5");
                    txtQuantity5.Text = rdrRepairOrder.ReadElementString("Quantity5");
                    txtSubTotal5.Text = rdrRepairOrder.ReadElementString("SubTotal5");
                    txtJobDescription1.Text =
			rdrRepairOrder.ReadElementString("JobDescription1");
                    txtJobPrice1.Text = rdrRepairOrder.ReadElementString("JobPrice1");
                    txtJobDescription2.Text =
			rdrRepairOrder.ReadElementString("JobDescription2");
                    txtJobPrice2.Text = rdrRepairOrder.ReadElementString("JobPrice2");
                    txtJobDescription3.Text =
			rdrRepairOrder.ReadElementString("JobDescription3");
                    txtJobPrice3.Text = rdrRepairOrder.ReadElementString("JobPrice3");
                    txtJobDescription4.Text =
			rdrRepairOrder.ReadElementString("JobDescription4");
                    txtJobPrice4.Text = rdrRepairOrder.ReadElementString("JobPrice4");
                    txtJobDescription5.Text =
			rdrRepairOrder.ReadElementString("JobDescription5");
                    txtJobPrice5.Text = rdrRepairOrder.ReadElementString("JobPrice5");
                    txtTotalParts.Text = rdrRepairOrder.ReadElementString("TotalPart");
                    txtTotalLabor.Text = rdrRepairOrder.ReadElementString("TotalLabor");
                    txtTaxRate.Text = rdrRepairOrder.ReadElementString("TaxRate");
                    txtTaxAmount.Text = rdrRepairOrder.ReadElementString("TaxAmount");
                    txtTotalOrder.Text = rdrRepairOrder.ReadElementString("TotalOrder");
                    txtRecommendations.Text =
			rdrRepairOrder.ReadElementString("Recommendation");
                }
            }
        }
    }
    catch (XmlException)
    {
        MessageBox.Show("The file name you provided is not valid");
    }
    finally
    {
        rdrRepairOrder.Close();
    }
}

Execute the application and open one the previous orders

Practical Learning: Indenting XML Nodes

Display the Central.cs file and, in the Members combo box, select mnuFileSave_Click(object sender, EventArgs e)

To control the indentation when the file is saved, change the top section of the event as follows:

private void mnuFileSave_Click(object sender, EventArgs e)
{
    . . . No Change

    // Find out if the user clicked OK after displaying the Save dialog box
    if (dlgSave.ShowDialog() == DialogResult.OK)
    {
        XmlTextWriter wtrRepairOrder = new XmlTextWriter(strFilename,
                    Encoding.UTF8);
        wtrRepairOrder.Formatting = Formatting.Indented;
        wtrRepairOrder.Indentation = 4;

    }

    . . . No Change
}

Return to the form
Click File and double-click Exit

Implement it as follows:

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

Execute the application
Create and save a few more repair orders
Close the form

Exercises

College Park Auto-Repair

Open the College Park Auto-Repair database from this lesson
Notice that if you open a repair order, change it and try to save it, the application would create a new repair order with a new receipt number.
Configure the form so that, if a repair order was previous opened then changed, if the user saves it, the current repair order would be saved, using its own receipt number instead of generating a new receipt number


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