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Reject duplicate field with number datatype

Reject duplicate field with number datatype

(OP)
I have a form with some text boxes and one of them is for a Code Number (number datatype). The form also contains an Add New Record button. I’m trying to code the Code Number field to reject any duplicate numbers. Yes, I’m aware that there’s an option in the field table properties that will allow for duplicates and no duplicates. But in this case, I would like to code the Code Number text box on the form to reject duplicate numbers along with a message box. Is this possible?

RE: Reject duplicate field with number datatype

Did you try this reply from the other thread where you asked this question?

You can use something like this for new records. I'm not sure if this is an issue for existing records.

CODE --> vba

Private Sub Code_Number_BeforeUpdate(Cancel As Integer)
    If Form.NewRecord Then
        If Not IsNull(DLookup("code_Number", "County_Rec", "Code_Number=" & Me.Code_Number.Text)) Then
            MsgBox "Duplicate Code Number."
            Cancel = True
        End If
    End If
End Sub 

Duane
Hook'D on Access
MS Access MVP

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