instead of using Load, use Activate event, seehttp://www.syncfusion.com/FAQ/WinForms/FAQ_c93c.asp#q960qListen to the Form's Activate event and set focus on the text box (using the Focus method). The common mistake is to try to set Focus in the Form_Load event. This is not possible because no Controls are visible at this time and hence focus cannot be set at this time.
或者:
public static Select(Control ctrl)
{
if(ctrl.CanSelect()) ctrl.Select();
}