public int Delete(DM_Kho dm)
        {
            DatabaseHelper help = new DatabaseHelper(); help.ConnectDatabase();
            using (var dbcxtransaction = help.ent.Database.BeginTransaction())
            {

                help.ent.DM_Kho.Attach(dm);
                help.ent.DM_Kho.Remove(dm);
                int temp = help.ent.SaveChanges();
                dbcxtransaction.Commit();
                return temp;
            }
        }
        public int Update(DM_Kho kho)
        {
            DatabaseHelper help = new DatabaseHelper();
            help.ConnectDatabase();
            int temp = 0;
            using (var dbcxtransaction = help.ent.Database.BeginTransaction())
            {
                using (var context = help.ent)
                {
                    context.DM_Kho.Attach(kho);
                    context.Entry(kho).State = EntityState.Modified;
                    temp = help.ent.SaveChanges();
                    dbcxtransaction.Commit();

                }

            }
            return temp;
        }