- If you programmatically move the focus from a ComboBox to another WinForms control, the text will remain selected even after the insertion point blinks in the next destination text field:
- Setting the ComboBox's SelectionLength or changing and resetting its SelectionText won't help.
- As workaround, create a Timer variable visible to the ComboBox: we'll let the default validation take place when the user hits Enter or changes index, and move the focus after 0.1 second.
Timer tmr = new Timer(); // Create class-scope variable:Note: if the field on which you want to move the focus is next in the tab order, no need for a timer; just simulate a Tab key press, with SendKeys.Send("{Tab}");.
- Attach a handler for the ComboBox's SelectedIndexChanged event, with the following code:
SendKeys.Send("{Esc}");
tmr.Interval = 100; // 0.1 seconds
tmr.Tick += SetNewFocus; // Method that will move the focus
tmr.Start(); // Launch countdownTip: the first line uses SendKeys to simulate a key press event (the Escape key deselects the text). Without the timer, the key press only fires when the focus has shifted to the target control.
- Now add a method to clear the timeout and switch the focus:
private void SetNewFocus(object sender, EventArgs e) {
NewTargetField.Focus(); // replace with your target field's name
tmr.Stop(); // Clear the timer
} - Problem fixed! Repeat the process for each ComboBox that moves focus to another control.
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