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3: Snappier Web Sites with AJAX
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Example C-12. The markup for Exercise 3-3 (continued)
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<asp:TextBox ID="txtVolume" runat="server"> </asp:TextBox> <cc1:SliderExtender ID="sleVolume" runat="server" TargetControlID="txtVolume" BoundControlID="txtVolume_Bound" Maximum="10"> </cc1:SliderExtender> </div> </div> </form> </body> </html>
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As you can imagine, there are many possible uses for a control like this, and for many of them, you would actually want to hide the textbox the control extends. You could use it as an actual volume control, for one thing, or you could use several of them to make a color slider like you find in a drawing application.
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Answers to Quiz Questions
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1. A DataSource control. 2. Binding. 3. A connection string is a string that contains the information necessary to connect to a database on a server. You can store the connection string in the web. config file for later use. 4. Create (add a new record), Retrieve, Update (edit), and Delete. 5. Use the GridView s Smart Tag and the Choose Data Source drop-down list. 6. Turn on paging by clicking the Smart Tag, and selecting Enable Paging. 7. It safeguards your data by only writing changes to the database if none of the records have changed since the records were read. 8. Enable Updating and Deleting, from the Smart Tag. 9. Create an event handler for the RowDataBound event. 10. Use a WHERE clause.
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Answers to Exercises
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Exercise 4-1. Here s one way to get a page that looks like Figure 4-27: 1. Create a new web site as usual. Name it Exercise 4-1. 2. Drag a SqlDataSource control onto the Design view.
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Appendix C: Answers to Quizzes and Exercises
3. Drag a GridView control onto the Design view. Click the GridView s Smart Tag, go to the Choose Data Source drop-down list, and select SqlDataSource1. 4. Click Configure Data Source in the Smart Tag. The Configure Data Source Wizard starts. You can use the connection string from the other exercises in this chapter. Click Next. 5. On the next page, click the radio button marked Specify columns from a table or view, and select the Product table from the drop-down list. Check the boxes for ProductID, Name, ProductNumber, Color, and ListPrice. The Wizard should look like Figure C-2.
Figure C-2. Creating the Select statement for your GridView.
6. Click the WHERE button. In the Add WHERE Clause dialog, select Weight in the Column drop-down list, select > (greater than) in the Operator drop-down list, and None in the Source drop-down list. The Value field appears on the right side of the box; enter 100 in the field. The dialog should look like Figure C-3. Click Add to add the WHERE clause, and OK to return to the Wizard. 7. Click the Advanced button and check both Generate INSERT, UPDATE, and DELETE statements and Use optimistic concurrency.
4: Saving and Retrieving Data |
Figure C-3. Adding the Where clause for your GridView.
8. Click Next to go to the next page; then click Finish to close the Wizard. Remember that this query won t work properly right now, so switch to Source view, find the four instances of [Product], and change them to [Production].[Product], like you did earlier in the chapter. 9. Return to Design View, click the Smart Tag for the GridView, and check the boxes for Enable Paging, Enable Sorting, Enable Editing, and Enable Deletion. Click AutoFormat, and select the Professional color scheme. Run your application. The Source code for this application looks like Example C-13.
Example C-13. The markup for Exercise 4-1
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Exercise 4-1</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" />
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Appendix C: Answers to Quizzes and Exercises
Example C-13. The markup for Exercise 4-1 (continued)
<div> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString= "<%$ ConnectionStrings:AdventureWorksConnectionString %>" SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [Color], [ListPrice] FROM [Production].[Product] WHERE ([Weight] > @Weight)" ConflictDetection="CompareAllValues" DeleteCommand="DELETE FROM [Production].[Product] WHERE [ProductID] = @ProductID" InsertCommand="INSERT INTO [Production].[Product] ([Name], [ProductNumber], [Color], [ListPrice]) VALUES (@Name, @ProductNumber, @Color, @ListPrice)" OldValuesParameterFormatString="original_{0}" UpdateCommand="UPDATE [Production].[Product] SET [Name] = @Name, [ProductNumber] = @ProductNumber, [Color] = @Color, [ListPrice] = @ListPrice WHERE [ProductID] = @ProductID"> <SelectParameters> <asp:Parameter DefaultValue="100" Name="Weight" Type="Decimal" /> </SelectParameters> <DeleteParameters> <asp:Parameter Name="ProductID" Type="Int32" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="Name" Type="String" /> <asp:Parameter Name="ProductNumber" Type="String" /> <asp:Parameter Name="Color" Type="String" /> <asp:Parameter Name="ListPrice" Type="Decimal" /> <asp:Parameter Name="ProductID" Type="Int32" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name="Name" Type="String" /> <asp:Parameter Name="ProductNumber" Type="String" /> <asp:Parameter Name="Color" Type="String" /> <asp:Parameter Name="ListPrice" Type="Decimal" /> </InsertParameters> </asp:SqlDataSource> </div> <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" CellPadding="4" ForeColor="#333333" GridLines="None" AllowPaging="True" AllowSorting="True"> <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> <RowStyle BackColor="#F7F6F3" ForeColor="#333333" /> <EditRowStyle BackColor="#999999" /> <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" /> <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /> <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
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