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The link factory contains two public static methods that generate department links. The first of the two methods generates links for department subpages, such as, for example, the second page of products in the Balloons for Children category. Calling Link.ToDepartment("2", "3") returns http://www.example.com:80/Catalog.aspx DepartmentID=2&Page=3 The second ToDepartment method is doesn t take the page parameter, and we ve included it for those cases when we want to easily obtain the URL of the first page. Calling Link.ToDepartment("2") returns http://www.example.com:80/Catalog.aspx DepartmentID=2

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SQLXML provides you with a set of managed classes that can be used to execute queries against the database and return results in XML form. The classes provided by SQLXML physically reside in an assembly, Microsoft.Data.SqlXml. The three core classes exposed by SQLXML are listed in Table 10-3. Table 10-3. SQLXML Managed Classes

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Now everything is in place, the only missing part being the DepartmentsList user control itself. You ll create a folder named UserControls that will hold this user control and the others you will create for BalloonShop. This user control will contain a DataList control that generates the list of departments. In this exercise, you ll implement most functionality by using the Design View of Visual Web Developer, and you ll see the HTML code that it generates. In other exercises, you ll work directly in Source View mode.

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1. Make sure that the project isn t currently running (if it is, the editing capabilities are limited), and that the Solution Explorer window is visible (if it isn t, choose View Solution Explorer or use the default Ctrl+Alt+L shortcut). Right-click the root entry and select New Folder. Enter UserControls as the name of the new folder, as shown in Figure 4-18.

SqlXmlCommand allows you to execute queries as well as non-queries against the database. This class exposes methods such as ExecuteNonQuery(), ExecuteStream(), and ExecuteXmlReader(). This class is analogous to the ADO.NET SqlCommand class. SqlXmlParameter represents parameters to the queries executed by using the SqlXmlCommand class. This class is analogous to the ADO.NET SqlParameter class. SqlXmlAdapter is used to interact with the ADO.NET DataSet class. This class is analogous to the ADO.NET SqlDataAdapter class.

Figure 4-18. Creating the UserControls folder 2. Let s now create a new Web User Control in the UserControls folder. Right-click the UserControls folder and then choose Add New Item. Select the Web User Control template and name it DepartmentsList.ascx (or simply DepartmentsList). Check the Place code in separate file check box, make sure the language is Visual C#, and click Add. 3. Switch DepartmentsList.ascx to Design View. Make sure the toolbox is visible (Ctrl+Alt+X), open the Data tab, and double-click the DataList entry. This will add a DataList control to DepartmentsList.ascx. 4. Use the Properties window (see Figure 4-19) to change the properties of your DataList, as shown in Table 4-3. (If the Properties window is not visible, press F4 to activate it.)

All the preceding classes can use the SQL Server OLEDB provider (SQLOLEDB) or the SQL Native Client to communicate with the underlying database. In the next few sections, you are going to learn how the SQLXML classes can be used in your .NET applications.

Figure 4-19. Changing the name of the DataList control 5. Open DepartmentsList.ascx in Design View, right-click the DataList control, and select Edit Template Header and Footer Templates. 6. Type Choose a Department in the header template (see Figure 4-20).

12. To read like this instead, comments are added between the /* and */.

7. Right-click the DataList and select Edit Template Item Templates. 8. Drag a HyperLink control from the Standard tab of the toolbox to the ItemTemplate. 9. Set the Text property of the HyperLink to an empty string. The list control should then look like Figure 4-21.

Let s begin by developing an application that will allow you to execute SELECT queries against the SQL Server database. The application user interface is shown in Figure 10-2.

Figure 4-21. Editing the templates of the DataList 10. Switch to Source View, where you need to make few changes to the HyperLink control, as shown in the following code snippet of the DataList control. Note that in your case, the order of the elements of the DataList control may be different. <asp:DataList ID="list" runat="server" Width="200px"> <HeaderStyle CssClass="DepartmentListHead" /> <HeaderTemplate> Choose a Department </HeaderTemplate> <ItemTemplate> <asp:HyperLink ID="HyperLink1" Runat="server" NavigateUrl='<%# Link.ToDepartment(Eval("DepartmentID").ToString())%>' Text='<%# HttpUtility.HtmlEncode(Eval("Name").ToString()) %>' ToolTip='<%# HttpUtility.HtmlEncode(Eval("Description").ToString()) %>' CssClass='<%# Eval("DepartmentID").ToString() == Request.QueryString["DepartmentID"] "DepartmentSelected" : "DepartmentUnselected" %>'> </asp:HyperLink> </ItemTemplate> </asp:DataList>

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