I have a form in Access. On the form I have a combo box called "cboPaymentMethod" and in the combo box there are 3 choices: cash, check, and free. I also have a text box called "CheckNum". Once the user picks "check" from the combo box they will tabl on through and when they get to the CheckNum field they are suppose to enter the check no. So to ensure that the user will enter the check no. I want to enter some code that will prompt the user to enter a check number if they have chose "check" from the dropdown.

Algorithm: If check is chosen in the PaymentMethod combo box
and the check num field is null
prompt user to go back and enter a check number.

Here is my code. Please look and see what I'm doing wrong or maybe I have the code in the wrong place.

Private Sub PrintRec_Click()
On Error Go to Err_PrintRec_Click

Dim rstTrans As New ADODB.Recordset
Dim fld As ADODB.Field
Dim strField As String
Dim curCount As Currency


If Me.cboPaymentMethod = "Check" And CheckNum.Text = "" Then 'Check number not entered
MsgBox "You must enter a check no."
CheckNum.SetFocus
End If

rstTrans.Open "dbo_tbl_Transactions", CurrentProject.Connection, adOpenKeyset, adLockOptimistic

If IsNull(Me.TempTransNumID.value) Then
'this is new record
rstTrans.AddNew
Else
'to stay on the record that was just inserted for editing
rstTrans.Find ("TransNumID=" + Str$(Me.TempTransNumID))
End If


rstTrans!TransDate = Me.TransDate
rstTrans!CustomerName = Me.CustomerName
rstTrans!VehType = Me.VehType
rstTrans!TktType = Me.TktType
rstTrans!Auth_By = Me.AuthBy
rstTrans!Quantity = Me.Quantity
rstTrans!SHtkt1 = Me.SHtkt1
rstTrans!SHtkt2 = Me.SHtkt2
rstTrans!HRtkt1 = Me.HRtkt1
rstTrans!HRtkt2 = Me.HRtkt2
rstTrans!TransPayAmt = Me.TransPayAmt
rstTrans!PaymentType = Me.txtPaymentType
rstTrans!PaymentMethod = Me.cboPaymentMethod
rstTrans!CheckNum = Me.CheckNum
rstTrans!TransReceiptMemo = Me.TransReceiptMemo
rstTrans!TransEntryTime = Now()
rstTrans!TransEntryUserID = appUser

rstTrans.Update
'this was a new record so update the form value of TransNumID for edit
If IsNull(rstTrans!TransNumID.value) <> True Then
Me.TempTransNumID = rstTrans!TransNumID.value
End If


whereClause = "NewQryShuttleHandiRideReceipt.TransNumID" & " = " & rstTrans!TransNumID

DoCmd.OpenReport "RptShuttle HandiRide Receipt", acViewNormal, , whereClause

rstTrans.Close

Set rstTrans = Nothing
Me.cmdAddRec.Enabled = True

Exit_PrintRec_Click:
MsgBox "Record Successfully Saved! Printing Receipt."
Exit Sub

Err_PrintRec_Click:
MsgBox Err.Description
Resume Exit_PrintRec_Click

End Sub

If Me.cboPaymentMethod = "Check" And Me.CheckNum = "" Then
'Check number not entered
MsgBox "You must enter a check no."
CheckNum.SetFocus
Goto Exit_PrintRec_Click
End If

...

then below:

MsgBox "Record Successfully Saved! Printing Receipt."

Exit_PrintRec_Click:

Exit Sub