private void FillData()
        {
            lblCapNhat.Text = "Thêm";
            if (MaPhongBan !=null&& MaPhongBan != "")
            {
                txtMaPhongBan.Enabled = false;
                lblCapNhat.Text = "Cập nhật";

                clsDM_PhongBan obj = new clsDM_PhongBan();
                obj.GetByKey(MaPhongBan);
                txtMaPhongBan.Text = obj.MaPhongBan;
                txtTenPhongBan.Text = obj.TenPhongBan;
                txtLoaiPhongBan.Text = obj.LoaiPhongBan;

                 cbActive.Checked=(bool)obj.Active ;
            }
        }
        private int Update(string strMa)
        {
            int kq = 0;
            clsDM_PhongBan obj = new clsDM_PhongBan();
            obj.MaPhongBan = strMa;
            obj.GetByKey(strMa);
            obj.TenPhongBan = txtTenPhongBan.Text;
            obj.LoaiPhongBan = txtLoaiPhongBan.Text;

            obj.Active = cbActive.Checked;
            kq = obj.Update();
            return kq;
        }