Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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462 x CHAPTER 13 DISPLAYING AND UPDATING DATA 1. You request the page in your browser and the page begins its page life cycle. 2. The GridView knows it is set up to retrieve and display data because it has a DataSourceID attribute that points to a SqlDataSource control. It contacts this data source control and asks it for its data. The SqlDataSource in turn connects to the database and then fires its SelectCommand, the SQL statement that selects the Id, Name, and SortOrder from the Genre table in the database: SelectCommand="SELECT [Id], [Name], [SortOrder] FROM [Genre]" 3. When the SqlDataSource receives the requested rows from the database it hands them over to the GridView, which creates an HTML table out of them using the bound fields that have been set up in the element. The GridView keeps track of the unique ID for each row that is displayed in the page by storing it in View State. 4. As soon as you click the Edit link, the page posts back. The GridView is able to see what row you clicked by looking at the associated DataKeyNames and retrieving the row’s ID from View State. It then gets the latest results from the database by asking the SqlDataSource again to fire its SelectCommand, and, finally, puts the selected row in edit mode so you can change the relevant details. When you click the Update link, the GridView collects the new values from the TextBox controls and then contacts the SqlDataSource again. 5. For each of the parameters in the element of the SqlDataSource, the GridView supplies a value. It retrieves the Id of the genre from the selected row, and then retrieves the new Name and SortOrder values from the TextBox controls in the page. 6. Armed with the relevant data for the Id, Name, and SortOrder, the SqlDataSource then executes its UpdateCommand against the database: UpdateCommand="UPDATE [Genre] SET [Name] = @Name, [SortOrder] = @SortOrder WHERE [Id] = @Id" Each of the parameters prefixed with the at symbol (@) is filled with the values that the GridView supplied. The SQL statement that gets sent to the database ends up looking similar to this: UPDATE [Genre] SET [Name] = 'New Name', [SortOrder] = 1 WHERE [Id] = 1 7. Finally, the GridView refreshes the data on the page by once again asking the SqlDataSource to execute its SelectCommand. This way, the GridView now displays the latest data with the update you made. The other commands work in a similar way and send their own SQL commands to the database. At the end of the exercise, you added a new Web.config file to the Management folder to reset the theme that is applied to all pages in the Management section. With the theme removed, it’s easier to focus on the functionality of the Management section, rather than be distracted by layout issues. In Chapter 15 you create a third theme specifically for the Management folder and apply that theme in the Web.config file in the Management folder. That way, your management pages will have a look and feel that’s different from the pages in the front end. Now that you’ve seen how to display, edit, and delete data, it’s time to learn how to insert new rows in the database using the DetailsView control.
Data Source and Data-Bound Controls Working Together x 463 Inserting Data with DetailsView Just as displaying, updating, and deleting data with the GridView are pretty easy, so is inserting data with the DetailsView control. The DetailsView supports a number of templates that enable you to customize the look and feel of the control in different modes. For example, the control has a , a , and a element that enable you to define the look of the top and bottom parts of the control. In addition, the control has a element that enables you to define the rows that should appear in the control, much like the element of the GridView. The DetailsView is able to display data in a few different modes. First of all, it can display an existing row in read-only mode. In addition, you can use the control to insert new rows and to update existing ones. You control the mode of the DetailsView with the DefaultMode property, which you can set to ReadOnly, Insert, and Edit, respectively. You see how to configure the DetailsView and set the DefaultMode property next. TRY IT OUT Inserting Data with the DetailsView Control In this exercise, you see how to use the DetailsView control to let your users insert new rows into the Genre table. As with the GridView example, the next exercise requires no coding from your side. All you need to do is drag and drop a few controls, set a few properties, and you’re done. Obviously, these code-free pages have limitations that make them less useful in more advanced scenarios. Therefore, later in this chapter, you see how to extend and customize these controls. 1. Go back to the Genres.aspx page in VS and make sure it’s in Design View. 2. Drag and drop a DetailsView control from the Data category of the Toolbox immediately below the GridView. If you have trouble dropping the control below the GridView but above the SqlDataSource control, you can simply drop it on the SqlDataSource; VS then adds the markup of the dropped control before the one you drop it on. 3. Open the control’s Smart Tasks panel if it didn’t open automatically and hook up the control to the existing SqlDataSource1 by selecting that name from the Choose Data Source drop-down list. 4. On the same Smart Tasks panel, select the Enable Inserting item. 5. Open the control’s Properties Grid by pressing F4 and then locate the DefaultMode property in the Behavior category. Set the DefaultMode to Insert. The code for the DetailsView should now look like this:
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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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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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4Working with ASP.NET Server Contro
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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 129 FinishButto
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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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Themes x 229 With this exported tem
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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 243 C# preferredTheme.Valu
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Skins x 245 a cookie called Preferr
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7Navigation WHAT YOU WILL LEARN IN
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17 Personalizing Websites WHAT YOU
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BConfiguring SQL Server 2012 So far
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allowAnonymous attribute - ASP.NET
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