////////////////////////////

        public bool DeleteOrder_Detail(Order_Detail x1)
        {
            string Sql = "delete from [Order_Detail]  where [Od_id] =" + x1.Od_id + " ";

            return(SqlDBHelper.ExecuteNonQuery(Sql));
        }
////////////////////////////

        public bool UpdateOrder_Detail(Order_Detail b1)
        {
            string sql = "update [Order_Detail] set [Reg_id]=" + b1.Reg_id + " ,[Om_id]=" + b1.Om_id + " ,[Book_id]=" + b1.Book_id + " ,[Qty]=" + b1.Qty + " ,[Rate]=" + b1.Rate + " ,[Amount]=" + b1.Amount + "   where [Od_id] =" + b1.Od_id + " ";

            return(SqlDBHelper.ExecuteNonQuery(sql));
        }