Combobox validating cancel

Posted by / 19-Oct-2019 09:03

This is because the selection is automatically cleared when the input focus moves from the combo box to the button. Label lbl = get Label(ctrl No, b Show Lbl, property.However, you should be aware that the selection can change automatically because of user interaction.For example, if you retrieve the Selected Text value in a button Click event handler, the value will be an empty string. In that case you should also somehow tell the user that there’s a problem with the field. For example, if the user presses Tab, clicks on another control, presses Enter to trigger the Accept button, or presses Esc to trigger the Cancel button.For example, you could display an error message, change the field’s background color, or at least beep to let the user know that focus did not leave the field because something is wrong. The event triggers even if the user tries to close the form.

Selection Change Committed = cbx_Example_Selection Change Committed; ...That means the user cannot close the form unless the field passes validation.Note also that the user can leave a field if it doesn’t have a This entry was posted in controls and tagged C#, C# programming, controls, example, example program, validate field, validate form, Validating event, Windows Forms programming. New() Initialize Component() ' Set button2 to be non-validating. Causes Validation = False End Sub Private Function Valid Email Address(By Val email Address As String, By Ref error Message As String) As Boolean ' Confirm there is text in the control. First you're using string values and are basing logic on these values, you might want to look into using an Enum and binding all it's values to the combo box.

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