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

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

              }

              }
              return temp;
        }