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DataAdapter is the bridge between an in-memory table and a physical table

File: App_Code\Product.cs using System; using System.Data; using System.Data.SqlClient; using System.Web.Configuration; using System.Collections.Generic; public class Product {     private static readonly string _connectionString;     public DataTable GetAll()     {         SqlDataAdapter dad = new SqlDataAdapter("SELECT Title,Director FROM Products", _connectionString);         DataTable dtblProducts = new DataTable();         dad.Fill(dtblProducts);         return dtblProducts;     }     static Product()     {         _connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;     } } File: Web.config <configuration>   <connectionStrings>     <add name="Products"           connectionString="Data Source=.\SQLEXPRESS;          AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />   </connectionStrings> </configuration> File: ShowProduct.aspx <%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">     <title>Show Product</title> </head> <body>     <form id="form1" runat="server">     <div>     <asp:GridView         id="grdProducts"         DataSourceID="srcProducts"         Runat="server" />      <asp:ObjectDataSource         id="srcProducts"         TypeName="Product"         SelectMethod="GetAll"         Runat="server" />     </div>     </form> </body> </html>