private void cmdThem_Click(object sender, RoutedEventArgs e)
 {
    // this.DialogResult = true;
     frmnhapkm frm = new frmnhapkm(false);
     this.DialogResult = false;
     frm.Show();
 }
 private void tableView1_RowDoubleClick(object sender, DevExpress.Xpf.Grid.RowDoubleClickEventArgs e)
 {
     frmnhapkm frm = new frmnhapkm(true);
     frm.txtmakm.Text = gridControl1.GetFocusedRowCellValue(ma_km).ToString().Trim();
     frm.txtmakm.IsReadOnly = true;
     frm.txtten.Text = gridControl1.GetFocusedRowCellValue(ten_ct).ToString().Trim();
     frm.dbatdau.EditValue = Convert.ToDateTime(gridControl1.GetFocusedRowCellValue(ngay_bd));
     frm.dketthuc.EditValue = Convert.ToDateTime(gridControl1.GetFocusedRowCellValue(ngay_kt));
     this.DialogResult = false;
     frm.Show();
 }