private int Delete(string strMaDM)
 {
     int kq = 0;
     clsDM_VTYT obj = new clsDM_VTYT();
     if (MessageBox.Show("Bạn muốn xóa?", "Thông báo", MessageBoxButtons.YesNo) == DialogResult.Yes)
     {
         kq = obj.Delete(strMaDM);
     }
     return kq;
 }
        private int Delete()
        {
            int kq = 0;
            clsDM_VTYT obj = new clsDM_VTYT();
            if (MessageBox.Show("Bạn muốn xóa?", "Thông báo", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                if (gridMaster.SelectedRows.Count != 0)
                {
                    DataGridViewRow row = this.gridMaster.SelectedRows[0];
                    string MaVTYT = row.Cells["MaVTYT"].Value.ToString();
                    kq = obj.Delete(MaVTYT);
                    if (kq > 0)
                    {
                        LoadGridView();
                    }
                }

            }

            return kq;
        }