private void btnXoa_Click(object sender, EventArgs e)
 {
     try
     {
         if (MessageBox.Show("Bạn có muốn xóa?", "Thông báo", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
         {
             var rowHandle = gridViewPhongHoc.FocusedRowHandle;
             int _caHocId  = O2S_Common.TypeConvert.Parse.ToInt32(gridViewPhongHoc.GetRowCellValue(rowHandle, "PhongHocId").ToString());
             if (PhongHocLogic.Delete(_caHocId))
             {
                 O2S_Common.Utilities.ThongBao.frmThongBao frmthongbao = new O2S_Common.Utilities.ThongBao.frmThongBao(Base.ThongBaoLable.XOA_THANH_CONG);
                 frmthongbao.Show();
                 LoadGridPhongHoc();
             }
         }
     }
     catch (Exception ex)
     {
         O2S_Common.Logging.LogSystem.Error(ex);
     }
 }