private void btnXoa_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
     if (MessageBox.Show("Bạn có chắc muốn xóa không?", "Thông báo", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
     {
         //DocGia_BUS.xoaSV(gvDocGia.GetFocusedRowCellValue(colMaSV).ToString());
         DocGia_BUS.xoaDG(gvDocGia.GetFocusedRowCellValue(colMaDG).ToString());
         DGbindingSource.RemoveAt(gvDocGia.FocusedRowHandle);
         MessageBox.Show("Xóa thành công!");
     }
 }
 private void btnHuy_Click(object sender, EventArgs e)
 {
     if (!them && gvDocGia.FocusedRowHandle == gvDocGia.RowCount - 1)
     {
         them = true;
         DGbindingSource.RemoveAt(gvDocGia.RowCount - 1);
     }
     //hủy khi sửa
     else
     {
         tbMaDG.Text  = gvDocGia.GetFocusedRowCellValue(colMaDG).ToString();
         tbTenDG.Text = gvDocGia.GetFocusedRowCellValue(colTenDG).ToString();
         //ToUpper để convert sang chữ in hoa
         if (gvDocGia.GetFocusedRowCellValue(colGioiTinh).ToString().ToUpper() == "NAM")
         {
             cboGioiTinh.SelectedIndex = 0;
         }
         else
         {
             cboGioiTinh.SelectedIndex = 1;
         }
         if (gvDocGia.GetFocusedRowCellValue(colNgaySinh).ToString() != "")
         {
             dtpNgaySinh.Value = DateTime.Parse(gvDocGia.GetFocusedRowCellValue(colNgaySinh).ToString());
         }
         if (gvDocGia.GetFocusedRowCellValue(colNgayCapThe).ToString() != "")
         {
             dtpNgayCapThe.Value = DateTime.Parse(gvDocGia.GetFocusedRowCellValue(colNgayCapThe).ToString());
         }
         if (gvDocGia.GetFocusedRowCellValue(colNgayHetHan).ToString() != "")
         {
             dtpNgayHetHan.Value = DateTime.Parse(gvDocGia.GetFocusedRowCellValue(colNgayHetHan).ToString());
         }
         tbSDT.Text    = gvDocGia.GetFocusedRowCellValue(colSDT).ToString();
         tbDiaChi.Text = gvDocGia.GetFocusedRowCellValue(colDiaChi).ToString();
         tbDonVi.Text  = gvDocGia.GetFocusedRowCellValue(colDonVi).ToString();
     }
 }