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else { // clear the GridView GridView1.DataSource = null; GridView1.DataBind(); } } 9. Save the page, and then view it in the browser. This time, notice a new entry, please select..., added to the DropDownList. Select one of the Manufacturers, and the Player list changes to the selected Manufacturer s Players. Select please select..., and notice that the list of Players disappears. 10. Experiment with changing the DropDownList to a RadioButtonList and a ListBox. Notice again that all three Web controls will have the please select... entry, as well as the list of Manufacturers, and selecting an option displays the same results, regardless of the type of Web list control that you re using.

10. Now, create a Web User Control named UserInfo.ascx in your UserControls folder. 11. In UserInfo, you ll use a new ASP.NET 2.0 control named LoginView, which can display different data (through templates) depending on the currently logged-in user. For users of the Administrators role, you ll display links to the administration pages, and if no users are logged in, you simply display a login link (using the LoginStatus control). You can edit the templates of the LoginView control by either using Design View or Source View. Either way, make sure your UserInfo Web User Control contains the following code:

<asp:SqlDataSource ID="sourceEmployees" runat="server" SelectCommand= "SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees" ...> </asp:SqlDataSource>

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Second, you need to define the filter expression. This is the portion that goes in the WHERE clause of a typical SQL query, and you write it in the same way as you used the DataView.RowFilter property in 9. (In fact, the SqlDataSource uses the DataView s row filtering abilities behind the scenes.) However, this has a catch if you re supplying the filter value from another source (such as a control), you need to define one or more placeholders, using the syntax {0} for the first placeholder, {1} for the second, and so on. You then supply the filter values using the <FilterParameters> section, in much the same way you supplied the select parameters in the first version. Here s the completed SqlDataSource tag:

The first thing that you ll notice about this code is that the Page_Load event is no longer populating the GridView, and this is now handled by the SelectedIndexChanged event of the Web list control. The Page_Load event is now solely responsible for creating the list of Manufacturers for the Web list control. As you saw in the previous example, this must be done only when the page is first loaded, so the first thing that you check is that this is indeed the first load of the page. If it is, you populate the Web list control in the same way as the previous example, by querying the Manufacturer table for the ManufacturerID and ManufacturerName combinations. Within the SelectedIndexChanged event, you first need to create a connection to the database, and then create the correct SQL query to execute: // create SqlConnection object string ConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(ConnectionString); // create SqlCommand object string CommandText = "SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage FROM Player WHERE PlayerManufacturerID = " + lstManufacturers.SelectedItem.Value; SqlCommand myCommand = new SqlCommand(CommandText, myConnection); The SQL query is constructed in the same way as in the previous example. You retrieve the value selected from the drop-down list using the SelectedItem.Value property and concatenate this with the rest of the query. Once you have a Command object, you can run the query and pass the results to the DataSource of the GridView and bind the results:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="UserInfo.ascx.cs" Inherits="UserInfo" %> <table cellspacing="0" border="0" width="200px" class="UserInfoContent"> <tr> <td class="UserInfoHead"> User Info</td> </tr> <asp:LoginView ID="LoginView1" runat="server"> <AnonymousTemplate> <tr> <td> <span class="UserInfoText">You are not logged in.</span> </td> </tr> <tr> <td>  » <asp:LoginStatus ID="LoginStatus1" runat="server" CssClass="UserInfoLink" />  « </td> </tr> </AnonymousTemplate> <RoleGroups> <asp:RoleGroup Roles="Administrators"> <ContentTemplate> <tr> <td> <asp:LoginName ID="LoginName2" runat="server" FormatString= "You are logged in as <b>{0}</b>. " CssClass="UserInfoText" /> </td> </tr> <tr> <td>  » <asp:LoginStatus ID="LoginStatus2" runat="server" CssClass= "UserInfoLink" />  « </td> </tr> <tr> <td>  » <a class="UserInfoLink" href="CatalogAdmin.aspx">

<asp:SqlDataSource ID="sourceEmployees" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>"

SelectCommand= "SELECT EmployeeID, FirstName, LastName, Title, City FROM Employees" FilterExpression="City='{0}'" EnableCaching="True"> <FilterParameters> <asp:ControlParameter ControlID="lstCities" Name="City" PropertyName="SelectedValue" /> </FilterParameters> </asp:SqlDataSource>

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