How do I require a user to enter data in a field?

I have a form that I want to require users to enter data. If the Scheduled Appt field on the form equals yes then require the user to enter the date and time in the App Date/Time field. If the scheduled Appt field equals No then the App Date/Time must be Null. See attached
Scheduled-App.docx
shieldscoAsked:
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pdebaetsCommented:
You can use the form BeforeUpdate event procedure to check for these conditions before the data gets updated. Here's an example

if ScheduledAppt  then
    if trim("" & ApptDateTime) = "" then
        msgbox "An Appt Date and Time is required." & vbcrlf & vbcrlf & "Press <ESC> to undo your changes"
        cancel = true
    end if
else
    if trim("" & ApptDateTime) = "" then
    else
        msgbox "An Appt Date and Time is not allowed." & vbcrlf & vbcrlf & "Press <ESC> to undo your changes"
        cancel = true
    end if
end if

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als315Commented:
Test this example (Form1)
DB27377446.mdb
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shieldscoAuthor Commented:
I used the following code  with no effect: Private Sub AppDtTime_BeforeUpdate(Cancel As Integer)
If SchAppt Then
    If Trim("" & AppDtTime) = "" Then
        MsgBox "An Appt Date and Time is required." & vbCrLf & vbCrLf & "Press <ESC> to undo your changes"
        Cancel = True
    End If
Else
    If Trim("" & AppDtTime) = "" Then
    Else
        MsgBox "An Appt Date and Time is not allowed." & vbCrLf & vbCrLf & "Press <ESC> to undo your changes"
        Cancel = True
    End If
End If
End Sub
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pdebaetsCommented:
Put the code in the form BeforeUpdate event procedure not the AppDtTime control BeforeUpdate event procedure.
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shieldscoAuthor Commented:
works good thanks
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shieldscoAuthor Commented:
Very good
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