ADO Database ASP.Net

     SelectCommand="SELECT * FROM [Customers]"
     FilterExpression="CustomerID='@CustomerID'"
     ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>">
     
                       PropertyName="SelectedValue">
     


File: Web.config

  
  
                     connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=True"
             providerName="System.Data.SqlClient" />