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Chapter 8: Control Events and Event Handlers 199If you click on the page and the default Page_Load method has been removed from theC# code, a new one will appear. Visual Studio 2008 is pretty smart and knows that if youhave one page-loading event, another would just conflict with it. In a single page-loadingevent function or subroutine, you can enter as many statements as you want, so havingmore than a single event handler for a single event does not make any sense even formultiple statements.Some web controls like the Label do not generate event code when double-clicked inthe Design mode. The Label web control can be a useful information source, and with theright design you may well want labels with events and event handlers. Fortunately, youcan add certain events to virtually any web control if you want. You just don’t do it bydouble-clicking the object in the Design mode, as you will see in the next two sections.Selecting Events in the Properties WindowIn the Design or Split mode, if you select a web control, you can see the available eventsin the Properties window. When you open the Properties window, click the LightningBolt icon. All of the events for the selected web control appear. The following stepsprovide a simple example:1. In a new Web Site add a Label web control to the Design portion while in the Splitmode.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 withthe 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 notgenerate them automatically in ASP.NET and C# by double-clicking them in the Designwindow. However, working with the Properties window, as soon as you enter an eventname such as LabelEvent as shown in Figure 8-1, the code for both the ASP.NET andC# portions of the application are automatically coded.
200ASP.NET 3.5: A Beginner’s GuideFigure 8-1 Label web control events displayed in the Properties windowIntelliSense and EventsA third way to easily get your events into your application is to use the IntelliSensecontext menus that pop up in the Source mode. The following simple steps show how:1. Add a TextBox web control to your application in the Source mode.2. Click inside the tag and press SPACEBAR. A context menu opens.3. Type the letter o and you will see all of the events associated with the TextBox webcontrol. Notice that every event has a lightning bolt next to it. (Also, events all beginwith “On”—OnInit, OnLoad.) Figure 8-2 shows what you can expect to see.Unlike using either the double-click method in the Design mode or selecting eventsin the Properties window, when using IntelliSense in the Source mode, you will have
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ASP.NET 3.5A Beginner’s Guide
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ASP.NET 3.5A Beginner’s GuideWill
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This book is dedicated to Ricky, Ol
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Contents at a GlancePART I Getting
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For more information about this tit
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Contents xiUsing HTML Forms Interac
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Contents xiiiCREATE: The SQL Comman
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Contents xv17 ASP.NET Ajax . . . .
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AcknowledgmentsThis book was greatl
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IntroductionWhat distinguishes the
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Introduction xxiWhat This Book Cove
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Introduction xxiiiChapter 7: CSS fo
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Chapter 17: ASP.NET Ajax One of the
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Part IGetting StartedCopyright © 2
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Chapter 1Introduction toASP.NET 3.5
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Chapter 1: Introduction to ASP.NET
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Chapter 4Doing More withC# and ASP.
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Part IIForms and ControlsCopyright
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Chapter 5HTML Forms: A ReviewCopyri
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Part IIIASP.NET and DatabasesCopyri
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Chapter 11A SQL PrimerCopyright ©
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Chapter 11: A SQL Primer 271the dat
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Chapter 11: A SQL Primer 275Specify
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Chapter 12ADO.NET:Hello DatabaseCop
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Chapter 12: ADO.NET: Hello Database
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Chapter 13Data BindingCopyright ©
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Chapter 13: Data Binding 331On the
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Chapter 14LINQCopyright © 2009 by
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Chapter 14: LINQ 355TIPTry ThisThis
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Chapter 14: LINQ 359Figure 14-5 Add
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Chapter 14: LINQ 365As you can see,
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Chapter 14: LINQ 369are used with a
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Chapter 15FilesCopyright © 2009 by
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Chapter 15: Files 373The bulk of th
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Chapter 16SecurityCopyright © 2009
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Chapter 16: Security 391certain peo
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Chapter 17ASP.NET AjaxCopyright ©
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Index< > (arrow brackets), 36Aacces
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Index 443ConVarASP.NET, 55C#, 56coo
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Index 445IntelliSense, 27and events
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Index 447StreamReader, 381StreamWri
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