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The SqlConnection, SqlCommand, and SqlDataReader objects (C#)

<%@ Page Language="C#" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.SqlClient" %> <%@ Import Namespace="System.Configuration" %> <script runat="server">     protected void Page_Load(object sender, EventArgs e)     {         if (!Page.IsPostBack)         {             SqlConnection MyConnection;             SqlCommand MyCommand;             SqlDataReader MyReader;             MyConnection = new SqlConnection();             MyConnection.ConnectionString = ConfigurationManager.ConnectionStrings["DSN_Northwind"].ConnectionString;             MyCommand = new SqlCommand();             MyCommand.CommandText = " SELECT TOP 3 * FROM CUSTOMERS ";             MyCommand.CommandType = CommandType.Text;             MyCommand.Connection = MyConnection;             MyCommand.Connection.Open();             MyReader = MyCommand.ExecuteReader(CommandBehavior.CloseConnection);             gvCustomers.DataSource = MyReader;             gvCustomers.DataBind();             MyCommand.Dispose();             MyConnection.Dispose();         }     } </script> <html> <body>     <form id="form1" runat="server">     <div>         <asp:GridView ID="gvCustomers" runat="server">         </asp:GridView>         </div>     </form> </body> </html> File: Web.config <configuration>   <connectionStrings>         <add name="DSN_Northwind"               connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=True"              providerName="System.Data.SqlClient" />     </connectionStrings> </configuration>