Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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566 x CHAPTER 15 WORKING WITH DATA — ADVANCED TOPICS VB.NET Private Sub WriteMessage( Optional handlerName As String = "") If Page.IsPostBack Then PostBack.Text &= handlerName & "" Else NoPostBack.Text &= handlerName & "" End If End Sub C# private void WriteMessage([CallerMemberName] string handlerName = "") { if (Page.IsPostBack) { PostBack.Text += handlerName + ""; } else { NoPostBack.Text += handlerName + ""; } } 10. To each of the event handlers that you have set up, add the following code that calls your custom method. Because you’re not passing a value for the optional handlerName parameter, .NET automatically inserts the name of the calling method because of the CallerMemberName attribute applied to that parameter in the WriteMessage method. You see how this works later. VB.NET Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load WriteMessage() End Sub C# protected void Page_Load(object sender, EventArgs e) { WriteMessage(); } 11. Finally, add the following event handler to the Code Behind manually: VB.NET Protected Sub Page_PreRenderComplete(sender As Object, e As EventArgs) Handles Me.PreRenderComplete WriteMessage("Page_PreRenderComplete — — — — — — — — ") End Sub C# protected void Page_PreRenderComplete(object sender, EventArgs e) { WriteMessage("Page_PreRenderComplete — — — — — — — — "); }
Handling Events x 567 The PreRenderComplete event fires very late in the Page control’s life cycle, making it an ideal place to put a line at the bottom of the event list. That way you can clearly see what set of events belong to each other, which in turn helps you to figure out what events are triggered during page load or a postback. 12. Save all your changes and open the page in the browser. In addition to the GridView with the available genres, you should also see a list with event names under the No PostBack heading: Page_Load EntityDataSource1_ContextCreating EntityDataSource1_Selecting GridView1_DataBinding GridView1_RowCreated GridView1_RowDataBound GridView1_RowCreated GridView1_RowDataBound ... GridView1_DataBound Page_PreRenderComplete — — — — — — — — - Note that the RowCreated and RowDataBound events are repeated multiple times — once for each genre from the database plus two more. You see later why that is. Click the button below the GridView to cause a postback. The No PostBack label won’t change, but the PostBack label now shows the following list of event names: GridView1_RowCreated GridView1_RowCreated ... GridView1_RowCreated GridView1_RowCreated Page_Load Button1_Click Page_PreRenderComplete — — — — — — — — - Click one of the column headers of the GridView to order the data it is displaying. Notice that the second label’s text is extended with a second set of event names. Each set is separated by a line of dashes, created by the Page_PreRenderComplete event handler. How It Works Technically, this exercise isn’t complicated. You set up a bunch of event handlers for the various controls in your page. Inside the event handler you call a method that checks whether the page is currently loading for the first time or is loading due to a postback. To make it easy to add the name of the calling method to the Label control, the handlerName parameter of the method has a special CallerMemberName attribute applied, like this: VB.NET Private Sub WriteMessage( Optional handlerName As String = "") C# private void WriteMessage([CallerMemberName] string handlerName = "")
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BEGINNING ASP.NET 4.5 FOREWORD . .
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BEGINNING ASP.NET 4.5 IN C# AND VB
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—To Niek
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CREDITS Acquisitions Editor Mary Ja
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CONTENTS FOREWORD INTRODUCTION xxxi
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CONTENTS Working with Files in Your
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CONTENTS Not All Controls Rely on V
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CONTENTS Skins 245 Creating a Skin
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CONTENTS Providing Feedback to User
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CONTENTS Single Item Controls 455 P
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CONTENTS Authentication: How Can Yo
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CONTENTS Introducing Bundling and M
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INTRODUCTION TO BUILD EFFECTIVE AND
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INTRODUCTION ‰ Chapter 4, “Work
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INTRODUCTION HOW THIS BOOK IS STRUC
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INTRODUCTION ‰ Code shown for the
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INTRODUCTION FIGURE I-2 The Site fo
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BEGINNING ASP.NET 4.5
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2 x CHAPTER 1 GETTING STARTED WITH
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34 x CHAPTER 2 BUILDING AN ASP.NET
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66 x CHAPTER 3 DESIGNING YOUR WEB P
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100 x CHAPTER 3 DESIGNING YOUR WEB
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4Working with ASP.NET Server Contro
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Introduction to Server Controls x 1
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Introduction to Server Controls x 1
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A Closer Look at ASP.NET Server Con
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A Closer Look at ASP.NET Server Con
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Types of Controls x 117 FIGURE 4-4
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Types of Controls x 119 The Smart T
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Types of Controls x 121 } DropDownL
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Types of Controls x 123 Container C
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Types of Controls x 125 Note that t
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Types of Controls x 127 FIGURE 4-12
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Types of Controls x 129 FinishButto
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Types of Controls x 131 FileUpload
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Types of Controls x 133 Validation
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The ASP.NET State Engine x 135 serv
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The ASP.NET State Engine x 137 FIGU
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The ASP.NET State Engine x 139 4. A
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Practical Tips on Working with Cont
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Summary x 143 ⊲ WHAT YOU LEARNED
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146 x CHAPTER 5 PROGRAMMING YOUR AS
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6Creating Consistent Looking Websit
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Consistent Page Layout with Master
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Using a Centralized Base Page x 219
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Themes x 229 With this exported tem
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Themes x 231 Replace Theme with Sty
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Themes x 233 type="text/css" rel=
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Themes x 235 ASP.NET themes are not
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Themes x 237 FIGURE 6-19 How It Wor
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Themes x 239 VB.NET Dim myCookie As
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Themes x 241 FIGURE 6-21 Within the
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Themes x 243 C# preferredTheme.Valu
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Skins x 245 a cookie called Preferr
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Skins x 247 3. In the Extension box
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Practical Tips on Creating Consiste
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Summary x 251 The imaginary CSS cla
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7Navigation WHAT YOU WILL LEARN IN
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Different Ways to Move Around Your
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Using the Navigation Controls x 257
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Programmatic Redirection x 277 Redi
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Programmatic Redirection x 279 How
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Practical Tips on Navigation x 281
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286 x CHAPTER 8 USER CONTROLS advan
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312 x CHAPTER 9 VALIDATING USER INP
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10 ASP.NET AJAX WHAT YOU WILL LEARN
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Using ASP.NET AJAX in Your Projects
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Using Web Services and Page Methods
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Practical Ajax Tips x 381 How It Wo
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386 x CHAPTER 11 JQUERY Fortunately
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388 x CHAPTER 11 JQUERY FIGURE 11-1
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390 x CHAPTER 11 JQUERY This lists
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392 x CHAPTER 11 JQUERY In addition
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454 x CHAPTER 13 DISPLAYING AND UPD
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14 LINQ and the ADO.NET Entity Fram
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Introducing LINQ x 499 surprise tha
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Mapping Your Data Model to an Objec
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Introducing Query Syntax x 507 and
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Introducing Query Syntax x 509 Wher
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Introducing Query Syntax x 511 Firs
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Introducing Query Syntax x 513 diff
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The Role Manager x 627 such as the
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The Role Manager x 629 1 . From wit
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The Role Manager x 631 FIGURE 16-19
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The Role Manager x 633 2. Save and
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The Role Manager x 635 Management s
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The Role Manager x 637 Alternativel
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The Role Manager x 639 } } case Lis
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Summary x 641 SUMMARY You can imple
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17 Personalizing Websites WHAT YOU
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Understanding Profile x 645 In the
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Understanding Profile x 647 You can
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Understanding Profile x 649 5. To t
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Understanding Profile x 651 To defi
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Understanding Profile x 653 press t
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Understanding Profile x 655 10. Dou
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Understanding Profile x 657 1. In M
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Understanding Profile x 659 e As Ev
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Understanding Profile x 661 That’
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Understanding Profile x 663 By clic
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Understanding Profile x 665 sent to
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Understanding Profile x 667 5. From
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Understanding Profile x 669 10. Ent
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Other Ways of Dealing with Profile
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Summary x 675 How It Works Much of
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680 x CHAPTER 18 EXCEPTION HANDLING
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BConfiguring SQL Server 2012 So far
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Configuring SQL Server 2012 x 795 C
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Configuring SQL Server 2012 x 797 Y
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allowAnonymous attribute - ASP.NET
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decimal data type - DynamicEnableDe
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input controls - handling input co
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text strings - types validation con
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validation controls- ViewState coll
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web services - Where clause flow of
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