private void HienThiDSLopMon()
        {
            dgvLopMon.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
            PhanCongGiangDayDAL LopMonDAL = new PhanCongGiangDayDAL();

            dgvLopMon.DataSource = LopMonDAL.LayMonLop();
        }
        private void btPhanCong_Click(object sender, EventArgs e)
        {
            // if(magv!=0 &&mamon!=0&& malop!=0)
            {
                PhanCongGiangDayDAL LopMonDAL = new PhanCongGiangDayDAL();
                LopMonDAL.PhanCong(this.mamon, this.malop, this.magv);

                HienThiDSLopMon();
                this.magv  = 0;
                this.malop = 0;
                this.mamon = 0;
            }
            //else
            //{
            //    MessageBox.Show("heheh", "");
            //}
        }