ASP.NET to view sql datas in grid view

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

namespace WebApplication2

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            SqlConnection con = new SqlConnection("Data Source=siva-pc;Initial Catalog=master;Integrated Security=True");

            SqlCommand cmd = new SqlCommand("select * from REG1", con);

            con.Open();

            SqlDataReader rdr = cmd.ExecuteReader();

            GridView1.DataSource = rdr;

            GridView1.DataBind();

            con.Close();

        }

    }

}