Private Sub End_Date_BeforeUpdate(Cancel As Integer)
If Me.End_Date >= Me.Start_Date Then
MsgBox "Check your date range. The End Date must be equal to or after the Start Date."
Seems to work. Please let me know if you see problems with it. Also, how can I keep the record from updating if the end date is less than the start date? Do I need to use another event other than the Before Update?