private void load_data()
        {
            SqlConnection con = new SqlConnection(dbclass.constring);
            try
            {
              

                string query = "SELECT * from tbl_customer ";
                SqlCommand cmd = new SqlCommand(query, con);
                SqlDataAdapter adp = new SqlDataAdapter(cmd);
                DataTable datatable = new DataTable();
                adp.Fill(datatable);
                this.Grid1.DataSource = AutoNumberedTable(datatable);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                dbclass.con.Close();
            }

        }