disconnection oriented programming

              SqlConnection con = new SqlConnection("Data Source=RKMS-PC\\SQLEXPRESS;Initial Catalog=master;Integrated Security=True");
            SqlCommand cmd= new SqlCommand();
            SqlDataAdapter da = new SqlDataAdapter("select * FROM EMPDETAILS", con);
            DataSet ds = new DataSet();
            da.Fill(ds,"emp");
            dispGridView1.DataSource = ds.Tables[0];