How to use ExecuteReader() method in ASP.Net c#?

In this article we will discuss, how to use ExecuteReader() method in ASP.Net c#. When we want to return more than a single value by using ExecuteReader().

Example:

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //Create the connection object
                SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ShoppingZone"].ConnectionString); ;
                try
               {
                   // Pass theconnection to the command object, so the command object knows on which
                   // connection toexecute the command
                   SqlCommand cmd = new SqlCommand("Select * from employee", connection);
                   // Open theconnection. Otherwise you get a runtime error. An open connection is
                   // required toexecute the command
                    connection.Open();
                   GridView1.DataSource = cmd.ExecuteReader();
                   GridView1.DataBind();
               }
                catch (Exception ex)
               {
                   // HandleExceptions, if any
               }
                finally
               {
                   // The finallyblock is guarenteed to execute even if there is an exception. 
                   //  This ensures connections are always properlyclosed.
                   connection.Close();
               }
           }
}