Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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460 x CHAPTER 13 DISPLAYING AND UPDATING DATA How It Works You didn’t manually write any code to interact with the database in this exercise, but you got a lot of functionality simply by dragging and dropping a database table. To see how it works, take a look at the source that VS generated. First, look at the markup for the SqlDataSource control: I changed the order of the attributes so all the commands are placed together. In your case, you may have the ProviderName attribute in a different location. As with all ASP.NET controls, the order of attributes in the control declaration doesn’t matter. A couple of interesting things are worth examining. First, note that the ConnectionString and ProviderName attributes point to a connection string that has been defined in the Web.config file. You see more of this in the next section, including an explanation of the syntax used for the attributes. You then see four commands, each one of them containing a SQL statement that is used for one of the four operations of the CRUD acronym. The INSERT, UPDATE, and DELETE commands contain parameters, identified by the at symbol (@) prefix. At run time, when the control is asked to perform the relevant data operation, these parameters are substituted by runtime values. The SqlDataSource control keeps track of the relevant parameters in the *Parameters collections. For example, the element contains a single parameter for the Id (the primary key) of the genre: Note that the Name of the parameter minus the at symbol (@) lines up with the parameter in the SQL statement: DeleteCommand="DELETE FROM [Genre] WHERE [Id] = @Id"
Data Source and Data-Bound Controls Working Together x 461 Notice how VS has wrapped column and table names in square brackets ([]). You normally only need these if your column or table name contains a special character such as a space or the name matches a reserved word. VS is just cautious and adds them to all columns and tables. You can leave them in, but if you write your own SQL statements you don’t have to include them (although you could if you wanted to). All by itself, the SqlDataSource control can’t do much at this stage. It needs a data-bound control that tells it what data operations to execute. In this Try It Out exercise the data-bound control is the GridView that is defined with this code: The GridView contains a few important attributes. First, the DataKeyNames attribute tells the GridView what the primary key is of the row in the database. It needs this to uniquely identify rows in the grid. The DataSourceID attribute points to the SqlDataSource control that you saw earlier, whereas AllowPaging and AllowSorting enable their associated features on the GridView. Under the element you see a number of fields set up. First, you see a CommandField. A CommandField is a column in the GridView that enables a user to execute one or more actions for the row to which the CommandField applies. It ends up in the browser as one or more text links or buttons. In this example, ShowDeleteButton, ShowEditButton, and ShowSelectButton have all been set to True. This gives the grid the functionality you see in Figure 13-5. When you click one of the links that have been created by the CommandField, they’ll trigger a command at the server. For example, clicking the Edit link puts the GridView in edit mode so you can edit the selected row. Notice how clicking the Select link doesn’t seem to change the GridView at all. In Chapter 15 you see how to create styles for the GridView so you can radically change the appearance of the control, including visually distinguishing a selected row from the others. If you want the GridView to render buttons instead of links, you need to set ButtonType to Button: The other three fields are so-called bound fields and map directly to the columns of the Genre table in the database with their DataField attribute so the GridView knows what data to display where. The GridView and SqlDataSource controls work together closely to retrieve and modify the data in the underlying data source. To give you an idea of how this works, here’s a rundown of the events that took place when you requested the Genres page in the browser and then edited a single genre:
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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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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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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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Introducing Query Syntax x 511 Firs
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Using Server Controls with LINQ Que
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Summary x 551 model. Combined with
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15 Working with Data — Advanced T
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Formatting Your Controls Using Styl
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Handling Events x 563 background-im
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Handling Events x 565 4. Make sure
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Handling Events x 567 The PreRender
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Handling Events x 569 Button1_Click
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Handling Events x 571 Select Case e
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Handling Events x 573 The RowDataBo
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Handling Events x 575 These classes
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Handling Events x 577 8. Save all y
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Hand-Coding Data Access Code x 579
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Caching x 589 In all the database e
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Caching x 591 Output Caching With o
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Caching x 593 Programmatic Caching
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Caching x 595 ‰ SummaryLabel ‰
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Caching x 597 } font-style: italic;
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Caching x 599 expiration date, whic
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Summary x 601 EXERCISES 1. Imagine
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16 Security in Your ASP.NET 4.5 Web
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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 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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790 x APPENDIX A EXERCISE ANSWERS }
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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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ClientID property - complex events
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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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