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Listing 9.17 - ShowControlParameter.aspx

Illustrates how to use the ASP.NET ControlParameter object.

Listing 9.17 - ShowControlParameter.aspx (C#)
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<%@ Page Language="C#" %>
<!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 id="Head1" runat="server">
    <title>Show Control Parameter</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:DropDownList
        id="ddlMovies"
        DataSourceID="srcMovies"
        DataTextField="Title"
        DataValueField="Id"
        Runat="server" />
    <asp:Button
        id="btnSelect"
        Text="Select"
        Runat="server" />
    
    <hr />
        
    <asp:DetailsView
        id="dtlMovie"
        DataSourceID="srcMovieDetails"
        Runat="server" />
        
    <asp:SqlDataSource
        id="srcMovies"
        SelectCommand="SELECT Id,Title FROM Movies"
        ConnectionString="<%$ ConnectionStrings:Movies %>"
        Runat="server" />       
    
    <asp:SqlDataSource
        id="srcMovieDetails"
        SelectCommand="SELECT * FROM Movies
            WHERE Id=@Id"
        ConnectionString="<%$ ConnectionStrings:Movies %>"
        Runat="server">
        <SelectParameters>
            <asp:ControlParameter Name="Id" ControlID="ddlMovies"
                PropertyName="SelectedValue" />
        </SelectParameters>       
    </asp:SqlDataSource>
    
    </div>
    </form>
</body>
</html>