I want to click on a Button (CreateRideEntries button created to open a form)and if a combo box(has list of events EventQ)is null, I want to prompt the user the make a selection from the combo box, then click on the CreateRideEntriesButton again and it take them to the form for That Event to enter data.

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Reply from Alex Hedley:

Replace 'EventQCombo' with the name of your Combo

If IsNull(EventQCombo) or EventQCombo = "" Then
  MsgBox "Please select an Event"
  EventQCombo.SetFocus
  EventQCombo.Dropdown
End If