Fatch data into DataSet by using ADO.Net

// Get Connection String from Web.Config file
 string conString = ConfigurationManager.ConnectionStrings["defaultConnection"].ConnectionString;
 using (SqlConnection con = new SqlConnection(conString))
 {
     con.Open();
     using(SqlCommand cmd = new SqlCommand())
     {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Connection = con;
            cmd.CommandText = "GetCustomers";   // SP Name
            cmd.Parameters.Add(new SqlParameter("RowId", 6));
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            da.Fill(ds);
     }
     con.Close();
 }