Building the User Interface Layer in .NET

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Building the User Interface Layer
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Use regions to organize the structure of your code By de ning a standard set of regions, you can more easily work with code written by any member of your coding team And by expanding and collapsing regions, you can more easily focus on one set of code at a time
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For the Purchase Tracker sample application: Open the ProductWin form in the Code Editor Add the regions as defined in this section In the Code Editor, open and close the regions to see how they hide and show their contents
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Creating Event Handlers
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Building Windows applications has always been about responding to events: a form loading, a button clicked, a combo box entry selected Visual Basic has always made it easy to place controls on forms and respond to each control s events The basic technique for putting controls on forms has not changed much since the rst versions of Visual Basic, but there are now more techniques for responding to the events from those controls using event handlers An event handler is a method that is executed in response to an event For example, a Windows form generates a Load event when the form is loaded You can write an event handler to handle the Load event and execute speci c code when the form loads If you have ever doubleclicked on a control on a form and then written code in the generated method, you have created an event handler This section details how to create an event handler for one control or for a set of controls at design time It also describes how to de ne event handlers at runtime
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Creating an Event Handler for One Control
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If you want to respond to a speci c event from one control, you can create an event handler for that one control s event For example, if you want to respond to a click on a speci c button, you can create an event handler for the Click event on that button
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The technique for creating an event handler for one event from one control has not changed Just double-click on the control, and Visual Studio generates the event handler for the most common event for that control If you need to create an event handler for an event that is not the most common event for the control, there are a few more steps The speci c steps depend on whether you generate the event handler when in the Code Editor or in the Forms Designer To write an event handler for an event generated by a single control using the Code Editor: 1 Open the form in the Code Editor 2 Select the control name from the Class Name drop-down at the top left of the Code Editor 3 Select the event name from the Event drop-down at the top right of the Code Editor Visual Studio then generates the event handler method signature and displays it in the Code Editor To write an event handler for an event generated by a single control from the Forms Designer: 1 2 3 4 5 Open the form in the Forms Designer Select the control on the form View the Properties window (View | Properties Window) Click Events in the Properties window toolbar Double-click on the desired event
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4 BUILDING THE USER INTERFACE LAYER
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Visual Studio generates the event handler method signature and displays it in the Code Editor For example, you could write an event handler for the Enter event to change the background color of a TextBox control when the user enters the control Select a TextBox control on a form, view the events in the Properties window, and double-click on the Enter event The resulting event handler generated in the Code Editor looks similar to the following:
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Private Sub NameTextBox_Enter(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles NameTextBoxEnter End Sub
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