Visual C++ .NET Examples: Object Serialization

	MS Visual C# Applications: Georgetown Cleaning Services

Introduction to Serialization

This application follows the Georgetown Cleaning Services that primarily demonstrated the use of various Windows controls such as the date picker, the time picker, and bitmap buttons. One of the issues that was not dealt with was the ability to save the customers orders.

In this application, after a customer's order has been processed, we will allow the user to save it.

Practical Learning: Introducing File-Based Databases

Start a new Windows Forms Application named GCS5
In the Solution Explorer, right-click Form1.cs and click Rename
Change the name to OrderProcessing.cs
In the Properties window, change the (Name) of the form to OrderProcessing
Right-click the form and click View Code

Change the name of the form in the Main() method to OrderProcessing

[STAThread]
static void Main() 
{
	Application.Run(new OrderProcessing());
}

Design the form as follows:

Control	Name	Text	Additional Properties
GroupBox		Order Identification
Label		Customer Name:
TextBox	txtCustomerName
Label		Customer Phone:
TextBox	txtCustomerPhone
Label		Date Left:
DateTimePicker	dtpDateLeft		Format: Custom Custom Format: dddd dd MMM yyyy
Label		Time Left:
DateTimePicker	dtpTimeLeft		Format: Time
Label		Date Expected:
DateTimePicker	dtpDateExpected		Format: Custom Custom Format: dddd dd MMM yyyy
Label		Time Expected:
DateTimePicker	dtpTimeExpected		Format: Time
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	cboItem1	None
TextBox	txtItem1UnitPrice	0.00	TextAlign: Right
TextBox	txtItem1Quantity	0	TextAlign: Right
TextBox	txtItem1SubTotal	0.00	TextAlign: Right
ComboBox	cboItem2	None
TextBox	txtItem2UnitPrice	0.00	TextAlign: Right
TextBox	txtItem2Quantity	0	TextAlign: Right
TextBox	txtItem2SubTotal	0.00	TextAlign: Right
ComboBox	cboItem3	None
TextBox	txtItem3UnitPrice	0.00	TextAlign: Right
TextBox	txtItem3Quantity	0	TextAlign: Right
TextBox	txtItem3SubTotal	0.00	TextAlign: Right
ComboBox	cboItem4	None
TextBox	txtItem4UnitPrice	0.00	TextAlign: Right
TextBox	txtItem4Quantity	0	TextAlign: Right
TextBox	txtItem4SubTotal	0.00	TextAlign: Right
GroupBox		Order Summary
Label		Cleaning Total:
TextBox	txtOrderTotal	0.00	TextAlign: Right
Label		Tax Rate:
TextBox	txtTaxRate	5.75	TextAlign: Right
Label		%
Label		Tax Amount:
TextBox	txtTaxAmount	0.00	TextAlign: Right
Label		Net Price:
TextBox	txtNetPrice	0.00	TextAlign: Right
Button	btnClose	Close
GroupBox		Maintenance
Button	btnSave...	Save
Button	btnReset	Reset
Label		Receipt #:
TextBox	txtReceiptNumber
Button	btnOpen	Open...

Click each combo box. Access its Items property and fill it up as follows:
Click OK and save All

On the form, double-click the Time Left control and implement its ValueChanged event as follows:

private void dtpTimeLeft_ValueChanged(object sender, System.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 clothese were left after 9AM, they will be availablethe following morning at 8AM
	this.dtpDateExpected.Value = new DateTime(dateLeft.Year, dateLeft.Month, dateLeft.Day + 1); 
	this.dtpTimeExpected.Value = new DateTime(dateLeft.Year, dateLeft.Month, dateLeft.Day + 1, 8, 0, 0);
	}
}

In the Class View, expand GCS5 followed by GCS5, followed by OrderProcessing
Right-click OrderProcessing-> Add -> Add Method...
Set the Method Access to internal
Accept the Return Type as void and set the Method Name to CalculateTotal

Press Enter and implement the method as follows:

internal void CalculateTotal()
{
decimal unitPriceShirts = 0.00M, unitPricePants = 0.00M, unitPriceItem1 = 0.00M,
	unitPriceItem2 = 0.00M, unitPriceItem3 = 0.00M, unitPriceItem4 = 0.00M;
decimal subTotalShirts = 0.00M, subTotalPants = 0.00M, subTotalItem1 = 0.00M,
		subTotalItem2 = 0.00M, subTotalItem3 = 0.00M, subTotalItem4 = 0.00M;
	int    qtyShirts = 1, qtyPants = 1, qtyItem1 = 1,
		qtyItem2 = 1, qtyItem3 = 1, qtyItem4 = 4;
decimal cleaningTotal = 0.00M, taxRate = 0.00M, taxAmount = 0.00M, netPrice = 0.00M;

	// Retrieve the unit price of this item
	// Just in case the user types an invalid value, we are using a try...catch
	try 
	{
		unitPriceShirts = decimal.Parse(this.txtShirtsUnitPrice.Text);
	}
	catch(FormatException )
	{
MessageBox.Show("The value you entered for the price of shirts is not valid" +
				"\nPlease try again");
	}

	// 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(this.txtShirtsQuantity.Text);
	}
	catch(FormatException )
	{
MessageBox.Show("The value you entered for the number of shirts is not valid" +
				"\nPlease try again");
	}
	try 
	{
		unitPricePants = decimal.Parse(this.txtPantsUnitPrice.Text);
	}
	catch(FormatException )
	{
	MessageBox.Show("The value you entered for the price of pants is not valid" +
					"\nPlease try again");
	}

	try 
	{
		qtyPants  = int.Parse(this.txtPantsQuantity.Text);
	}
	catch(FormatException )
	{
MessageBox.Show("The value you entered for the number of pants is not valid" +
				"\nPlease try again");
	}

	try 
	{
		unitPriceItem1 = decimal.Parse(this.txtItem1UnitPrice.Text);
	}
	catch(FormatException )
	{
	MessageBox.Show("The value you entered for the price is not valid" +
				"\nPlease try again");
	}
	try 
	{
		qtyItem1  = int.Parse(this.txtItem1Quantity.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered is not valid" +
				"\nPlease try again");
	}

	try 
	{
		unitPriceItem2 = decimal.Parse(this.txtItem2UnitPrice.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered for the price is not valid" +
				"\nPlease try again");
	}
	try 
	{
		qtyItem2  = int.Parse(this.txtItem2Quantity.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered is not valid" +
				"\nPlease try again");
	}

	try 
	{
		unitPriceItem3 = decimal.Parse(this.txtItem3UnitPrice.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered for the price is not valid" +
				"\nPlease try again");
	}
	try 
	{
		qtyItem3  = int.Parse(this.txtItem3Quantity.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered is not valid" +
				"\nPlease try again");
	}

	try 
	{
		unitPriceItem4 = decimal.Parse(this.txtItem4UnitPrice.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered for the price is not valid" +
				"\nPlease try again");
	}
	try 
	{
		qtyItem4  = int.Parse(this.txtItem4Quantity.Text);
	}
	catch(FormatException )
	{
		MessageBox.Show("The value you entered is not valid" +
				"\nPlease try again");
	}

	// 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 = decimal.Parse(this.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
	this.txtShirtsSubTotal.Text = subTotalShirts.ToString("F");
	this.txtPantsSubTotal.Text = subTotalPants.ToString("F");
	this.txtItem1SubTotal.Text = subTotalItem1.ToString("F");
	this.txtItem2SubTotal.Text = subTotalItem2.ToString("F");
	this.txtItem3SubTotal.Text = subTotalItem3.ToString("F");
	this.txtItem4SubTotal.Text = subTotalItem4.ToString("F");

	this.txtCleaningTotal.Text = cleaningTotal.ToString("F");
	this.txtTaxAmount.Text = taxAmount.ToString("F");
	this.txtNetPrice.Text = netPrice.ToString("F");		
}

Return to the form and click the quantity text box that corresponds to the Shirts
In the Properties window, click the Events button and double-click the Leave field

Implement the event as follows:

private void txtShirtsQuantity_Leave(object sender, System.EventArgs e)
{
	CalculateTotal();
}

Return to the form and click the quantity text box that corresponds to the Pants
In the Events section of the Properties window, double-click the Leave field and implement the event as follows:
private void txtPantsQuantity_Leave(object sender, System.EventArgs e) { CalculateTotal(); }
Return to the form and click the quantity text box that corresponds to the first combo box

In the Events section of the Properties window, double-click the Leave field, and implement the event as follows:

private void txtItem1Quantity_Leave(object sender, System.EventArgs e)
{
	if( this.cboItem1.Text != "None" )
		CalculateTotal();
	else
		MessageBox.Show("Make sure you select an item in the combo box");
}

Return to the form and click the quantity text box that corresponds to the second combo box

In the Events section of the Properties window, double-click the Leave field and implement the event as follows:

private void txtItem2Quantity_Leave(object sender, System.EventArgs e)
{
	if( this.cboItem2.Text != "None" )
		CalculateTotal();
	else
		MessageBox.Show("Make sure you select an item in the combo box");
}

Return to the form and click the quantity text box that corresponds to the third combo box

In the Events section of the Properties window, double-click the Leave field and implement the event as follows:

private void txtItem3Quantity_Leave(object sender, System.EventArgs e)
{
	if( this.cboItem3.Text != "None" )
		CalculateTotal();
	else
		MessageBox.Show("Make sure you select an item in the combo box");
}

Return to the form and click the quantity text box that corresponds to the fourth combo box

In the Events section of the Properties window, double-click the Leave field, and implement the event as follows:

private void txtItem4Quantity_Leave(object sender, System.EventArgs e)
{
	if( this.cboItem4.Text != "None" )
		CalculateTotal();
	else
		MessageBox.Show("Make sure you select an item in the combo box");
}

Return to the form and click the Tax Rate text box
In the Events section of the Properties window, double-click the Leave field and implement the event as follows:
private void txtTaxRate_Leave(object sender, System.EventArgs e) { CalculateTotal(); }

Double-click the Close button and implement its Click event as follows:

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

Return to the form.
Double-click the Reset button and implement its event as follows:

private void btnReset_Click(object sender, System.EventArgs e)
{
	// Reset the controls
	this.txtCustomerName.Text = "";
	this.txtCustomerPhone.Text = "";
	this.txtShirtsUnitPrice.Text = "1.25";
	this.txtShirtsQuantity.Text = "0";
	this.txtShirtsSubTotal.Text = "0.00";
	this.txtPantsUnitPrice.Text = "1.95";
	this.txtPantsQuantity.Text = "0";
	this.txtPantsSubTotal.Text = "0.00";
	this.cboItem1.Text = "None";
	this.txtItem1UnitPrice.Text = "0.00";
	this.txtItem1Quantity.Text = "0";
	this.txtItem1SubTotal.Text = "0.00";
	this.cboItem2.Text = "None";
	this.txtItem2UnitPrice.Text = "0.00";
	this.txtItem2Quantity.Text = "0";
	this.txtItem2SubTotal.Text = "0.00";
	this.cboItem3.Text = "None";
	this.txtItem3UnitPrice.Text = "0.00";
	this.txtItem3Quantity.Text = "0";
	this.txtItem3SubTotal.Text = "0.00";
	this.cboItem4.Text = "None";
	this.txtItem4UnitPrice.Text = "0.00";
	this.txtItem4Quantity.Text = "0";
	this.txtItem4SubTotal.Text = "0.00";
	this.txtCleaningTotal.Text = "0.00";
	this.txtTaxRate.Text = "5.75";
	this.txtTaxAmount.Text = "0.00";
	this.txtNetPrice.Text = "0.00";
	this.txtCustomerName.Focus();
}

Save all


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