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will cause the Text1TextChanged event to re For this reason, the code in Listing 85 can cause a crash
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Private Sub txtResult_TextChanged(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles txtResultTextChanged txtResultText += "" End Sub Listing 85: Code that will cause a crash
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The intention might have been to tidy up the format of the result by adding a period to the end of it, but the effect will be to change the text, which will in turn re the TextChanged event, which will change the text which It is worth watching for this type of cascading event as you write event-handlers
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Exercise 86
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From the explanation above, it is obvious that altering a control s contents within a handler for the Changed event can cause problems Look through the list of events for a TextBox, and try to identify a more suitable event for performing the task outlined in Listing 85 Write the code that would be placed in the suggested event s event-handler
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User-interface development for a Windows-based application can be done entirely in program code Listing 86 shows a minimal code example of a Console application in which a blank form is created and displayed
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Module SimpleForm Sub Main() Dim F As New WindowsFormsForm() WindowsFormsApplicationRun(F) End Sub End Module Listing 86: A Console application that displays a Windows Form
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If you create and run this application (to do so in Visual Studio, you will need to create a Console application and then add a reference to the SystemWindows Forms library to make the form class and the application class available), you will notice that as a Console application it still displays a Console window on the screen when it starts up However, a new blank form is immediately loaded on top of the Console window, which will then do nothing until you close the form, at which it will also close You can get rid of the Console window by going to the Project Properties dialog box and selecting Windows Application as the Output type
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The dif culty with developing a Windows application in this way is that you would now have to change the size of the form, add controls to it and associate them with the form, deal with user interactions and Windows messages and a great many other things, all in Visual Basic code Fortunately, Visual Studio provides us with designers for Windows applications that take care of all of these details and leave us to get on with writing the application code
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Let s look at a simple Windows form from a new Windows Form application Selecting File New Project and selecting to build a Windows Application, you will get a new project that automatically contains a single empty form This contains the code necessary to set up a Windows form and set it running Near the top of the form s Code window, you would nd a line:
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+ Windows Form Designer generated code
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(eg see near the top of Listing 82) By clicking on the little + sign at the left, you can open (or unfold) a lot of code that Visual Studio normally hides from you; shown in Listing 87
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Public Class Form1 Inherits SystemWindowsFormsForm #Region " Windows Form Designer generated code " Public Sub New() MyBaseNew() 'This call is required by the Windows Form Designer InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'Form overrides dispose to clean up the component list Protected Overloads Overrides Sub Dispose( _ ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then componentsDispose() End If End If MyBaseDispose(disposing) End Sub 'Required by the Windows Form Designer Private components As SystemComponentModelIContainer 'NOTE: The following procedure is required by the Windows 'Form Designer
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