List to manage employee code

I'm making a list of employee info , i want to do the following :
Whenever i enter a value in a cell of employee code feild , excel checks if
it is duplicated or not , if yes display an error message "Value duplicated "
or any action to reject the inserted value, if no the new value is accepted

Thank you

Private Sub Worksheet_Change(ByVal Target As Range)
Dim nFound As Long

On Error GoTo ws_exit:
Application.EnableEvents = False
If Not Intersect(Target, Me.Range("A1:A100")) Is Nothing Then
With Target
If Application.CountIf(Me.Range("A1:A100"), .Value) > 1 Then
MsgBox .Value & " is duplicate"
.Value = ""
End If
End With
End If

ws_exit:
Application.EnableEvents = True
End Sub

'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.





--
HTH

Bob Phillips

"Tahani" <[email protected]> wrote in message
news:[email protected]...
> I'm making a list of employee info , i want to do the following :
> Whenever i enter a value in a cell of employee code feild , excel checks
if
> it is duplicated or not , if yes display an error message "Value
duplicated "
> or any action to reject the inserted value, if no the new value is
accepted
>
> Thank you

Use Data Validation.

see http://www.j-walk.com/ss/excel/usertips/tip027.htm

DM Unseen

Thank you very much
Appreciate your help

"Bob Phillips" wrote:

> Private Sub Worksheet_Change(ByVal Target As Range)
> Dim nFound As Long
>
> On Error GoTo ws_exit:
> Application.EnableEvents = False
> If Not Intersect(Target, Me.Range("A1:A100")) Is Nothing Then
> With Target
> If Application.CountIf(Me.Range("A1:A100"), .Value) > 1 Then
> MsgBox .Value & " is duplicate"
> .Value = ""
> End If
> End With
> End If
>
> ws_exit:
> Application.EnableEvents = True
> End Sub
>
> 'This is worksheet event code, which means that it needs to be
> 'placed in the appropriate worksheet code module, not a standard
> 'code module. To do this, right-click on the sheet tab, select
> 'the View Code option from the menu, and paste the code in.
>
>
>
>
>
> --
> HTH
>
> Bob Phillips
>
> "Tahani" <[email protected]> wrote in message
> news:[email protected]...
> > I'm making a list of employee info , i want to do the following :
> > Whenever i enter a value in a cell of employee code feild , excel checks
> if
> > it is duplicated or not , if yes display an error message "Value
> duplicated "
> > or any action to reject the inserted value, if no the new value is
> accepted
> >
> > Thank you
>
>
>