n WinForms Applications in Visual Basic .NET

Print QR Code JIS X 0510 in Visual Basic .NET n WinForms Applications
8 n WinForms Applications
QR Code 2d Barcode Creator In Visual Basic .NET
Using Barcode creation for .NET framework Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
'It can be modified using the Windows Form Designer 'Do not modify it using the code editor <SystemDiagnosticsDebuggerStepThrough()> _ Private Sub InitializeComponent() components = New SystemComponentModelContainer() MeText = "Form1" End Sub #End Region End Class Listing 87: Windows Form Designer generated code for a blank form
Printing Barcode In Visual Basic .NET
Using Barcode maker for VS .NET Control to generate, create barcode image in .NET framework applications.
Apart from inserting a few line-breaks to make this code t better on the page, I ve made no changes to it Reassuringly, there is not much in the way of code that we have not met in some form before The code for the form is a Class de nition, and as you might expect it uses inheritance so that standard properties and methods for all Form classes are already de ned In the earlier example of a simple form, I created an object of the SystemWindowsFormsForm class, and here, the Windows Form Designer has created a new Form class by inheriting from the same class To kick off the design of a new class, the designer has added a constructor (Public Sub New()) which makes a call to InitializeComponent() This method is de ned later in the class and has the job of creating a Container component for the form, which will hold references to any other components added to the form, and setting the form s caption (the Text property) The only other method de ned for the new Form class is the Dispose() method, which is used to destroy the collection of objects added to the form (and the form itself) when it is no longer needed in an application To keep this code safe from tinkering, Visual Studio places most of it in a code region which by default is hidden It is worth examining the contents of the region after making some changes to a form to see its effect For example, if I change the form by adding a Windows control from the toolbox to the form in the Designer window, a new Button reference variable will be added to the Form class, and the code in InitializeComponent() will be changed so that the button is properly set up The button s variable is added with the statement:
Draw QR Code In C#
Using Barcode printer for .NET framework Control to generate, create Quick Response Code image in VS .NET applications.
Friend WithEvents Button1 As SystemWindowsFormsButton
QR Code 2d Barcode Drawer In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Using a Friend declaration for the button makes it accessible by any code within the assembly, so it is easily possible to change the properties of the button anywhere in the project The WithEvents keyword indicates that this control can be a source of events, which in turn tells the Form Designer that it may need to attach matching event-handling code to the form s code As a consequence of adding the button to the form, the InitializeComponent() method is changed, with statements added to create the Button object and set its initial properties (its location, where it occurs in the tab order of controls on the form and what caption will be displayed on its face) This is shown in Listing 88
QR Code JIS X 0510 Encoder In VS .NET
Using Barcode encoder for .NET Control to generate, create QR Code image in Visual Studio .NET applications.
83 User Interface Code and the Form Designer
Barcode Creator In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create bar code image in VS .NET applications.
<SystemDiagnosticsDebuggerStepThrough()> _ Private Sub InitializeComponent() MeButton1 = New SystemWindowsFormsButton() MeSuspendLayout() ' 'Button1 ' MeButton1Location = New SystemDrawingPoint(96, 96) MeButton1Name = "Button1" MeButton1TabIndex = 0 MeButton1Text = "Button1" ' 'Form1 ' MeAutoScaleBaseSize = New SystemDrawingSize(5, 13) MeClientSize = New SystemDrawingSize(292, 273) MeControlsAddRange(New SystemWindowsFormsControl() _ {MeButton1}) MeName = "Form1" MeText = "Form1" MeResumeLayout(False) End Sub Listing 88: Code added to the form by Form Designer when a button is placed on it
Drawing Bar Code In Visual Basic .NET
Using Barcode encoder for .NET Control to generate, create barcode image in .NET framework applications.
Note from Listing 88 that adding the Button control also makes changes to some of the form s own properties AutoScaleBaseSize is set to a value if a control with text is placed in the form s main area, and allows size calculations to be done based on the character size of the default font for the form (in this case, the font used in the button s caption text) ClientSize is established for the form so that code can be written to work out the available area for controls and graphics on the form and the form is given a default name During these manipulations of the form (remember that this sub will be executed at run time to set the form and its controls up), effort is saved in updating the form by calling SuspendLayout() Once the components are initialized, ResumeLayout() is called, which allows the operations that update the visible appearance of the form to be processed A double-click on the button s face in the Form Designer window will generate an outline event-handler for the button (Listing 89)
Creating Code 39 In VB.NET
Using Barcode generator for VS .NET Control to generate, create Code 39 image in .NET applications.
Private Sub Button1_Click(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles Button1Click 'Event handling code goes here End Sub Listing 89: An event-handler for the button added to the form
Code 128C Creation In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create Code128 image in VS .NET applications.
ECC200 Drawer In Visual Basic .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
Decoding Bar Code In .NET Framework
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Create Code 128C In Visual Studio .NET
Using Barcode generator for .NET Control to generate, create Code 128 Code Set A image in Visual Studio .NET applications.
Paint Code 128 Code Set A In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create USS Code 128 image in ASP.NET applications.
Painting Code39 In C#
Using Barcode printer for .NET framework Control to generate, create Code 3 of 9 image in .NET framework applications.
Bar Code Maker In VS .NET
Using Barcode maker for .NET framework Control to generate, create bar code image in .NET framework applications.