<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <script runat="server"> protected void btnSubmit_Click(object sender, EventArgs e) { lblProduct.Text = lstProducts.SelectedItem.Text; } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>Show ListBox</title> </head> <body> <form id="form1" runat="server"> <div> <asp:ListBox id="lstProducts" DataSourceID="srcProducts" DataTextField="Title" DataValueField="Id" Rows="8" Runat="server" /> <asp:Button id="btnSubmit" Text="Submit" OnClick="btnSubmit_Click" Runat="server" /> <hr /> <asp:Label id="lblProduct" Runat="server" /> <asp:SqlDataSource id="srcProducts" SelectCommand="SELECT Id, Title FROM Products" ConnectionString="<%$ ConnectionStrings:Products %>" Runat="server" /> </div> </form> </body> </html> File: Web.config <configuration> <connectionStrings> <add name="Products" connectionString="Data Source=.\SQLEXPRESS; AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" /> </connectionStrings> </configuration>