//fetch final products data in main grid view
protected void fetch_sell_data()
{
// String id = Session["id"].ToString();
DataTable dt = Select_Logic.Find_Selling_Data("select_selling_data_give_billno_cus_id_sp ", find_customer_id(), Session["bill_no"].ToString());
grv_prod_selling.DataSource = dt;
grv_prod_selling.DataBind();
DataTable dt1 = Select_Logic.Find_Total_Payment("select_total_payment_temp_selling_sp", find_customer_id(), Session["bill_no"].ToString());
txt_total_amount.Text = dt1.Rows[0][0].ToString();
}