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he ASPNET controls interact with C# primarily through events A function (or method) in C# has a name associated with some web control event assignment This chapter looks further into events, exploring how to find what events are associated with a given web control and how they can be used in ASPNET/C# applications Much of the material in this chapter will be familiar because virtually every ASPNET/C# application up to this point in the book has included an event if nothing more than a Page Load event However, we look further in this chapter to better use events and the web controls associated with them
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Whenever you open a new web site, the C# portion of the application has a function beginning with the line
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protected void Page_Load(object sender, EventArgs e)
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The name of the method is actually Page_Load, and the event that assigns the name Page_Load is part of C# and ASPNET assignment In other words, the event name is not Page_Load but something else In this case, it s a built-in OnLoad event assigned the value that Page_Load associated with the page object Because the name Page_Load sounds like an event, often developers just assume it s an event, but it s not It could have been named anything Hip_Hop, if the designers so desired
Double-Click in the Design Mode
The main shortcut for generating an event associated with a web control has been to double-click a web control in the Design mode and to use the default function name that appears in the C# code For example, if you double-click a TextBox control, you can expect to see the C# method beginning
protected void TextBox1_TextChanged(object sender, EventArgs e)
8: Control Events and Event Handlers
If you click on the page and the default Page_Load method has been removed from the C# code, a new one will appear Visual Studio 2008 is pretty smart and knows that if you have one page-loading event, another would just conflict with it In a single page-loading event function or subroutine, you can enter as many statements as you want, so having more than a single event handler for a single event does not make any sense even for multiple statements Some web controls like the Label do not generate event code when double-clicked in the Design mode The Label web control can be a useful information source, and with the right design you may well want labels with events and event handlers Fortunately, you can add certain events to virtually any web control if you want You just don t do it by double-clicking the object in the Design mode, as you will see in the next two sections
Selecting Events in the Properties Window
In the Design or Split mode, if you select a web control, you can see the available events in the Properties window When you open the Properties window, click the Lightning Bolt icon All of the events for the selected web control appear The following steps provide a simple example:
1 In a new Web Site add a Label web control to the Design portion while in the Split
mode
2 Select the Label control and open the Properties window 3 Click on the Lightning Bolt icon You will see a list of all events that can be used with
the Label web control as shown in Figure 8-1
4 Next to the Init event, type LabelEvent as shown in Figure 8-1
When working with web controls and events, do not depend on the double-click method in the Design or Split mode Some web controls that can have events do not generate them automatically in ASPNET and C# by double-clicking them in the Design window However, working with the Properties window, as soon as you enter an event name such as LabelEvent as shown in Figure 8-1, the code for both the ASPNET and C# portions of the application are automatically coded
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