Untitled Page Runat="server" SelectCommand="SELECT * FROM [Customers] WHERE ([CustomerID] = @CustomerID)" ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>" DataSourceMode="DataSet"> QueryStringField="ID" Type="String"/> File: Web.config connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=True" providerName="System.Data.SqlClient" />