Question

At the moment I have setup a custom ok cancel dialog with a drop down in c#. The ok and cancel buttons use the DialogResult property so no code behind it. What I now need to do is validate the drop down to check it isn’t left empty before posting back a dialogresult.

Is this possible?

Answer 1

From here

Double-click the Closing field, and implement it as follows:

private void Second_Closing(object sender,          System.ComponentModel.CancelEventArgs e) {     // When the user attempts to close the form, don't close it...     e.Cancel = (dropdown.selecteditemindex >= 0); }