check if value has already been used

Jockster

Board Regular
Joined
Jan 16, 2009
Messages
88
Hi,
Users can start an automatic copying process (active row from active sheet to sheet 2) by simply putting a date in a cell in column K. The activecell.row is copied over.
As part of the copying process, the value in cell D on the active row (the serial number) is copied to sheet 2.
Before this happens, I would like a checking procedure added to the code which will stop the same row being copied more than once, thus avoiding duplicates.
I have tried InStr and also worksheet.CountIf but can't figure this out.
Code snippet below.
Code:
  If InStr(1, Sheets("Sheet!2").Range("A:A" & lngLastRow), TempRef) Then
where the value in TempRef (the serial number) is searched for in Sheet 2 col A.
all help appreciated.
 

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Try like this

Code:
If IsNumeric(Application.Match(TempRef, Sheets("Sheet2").Columns("A"), 0)) Then ' it would be a dup
 
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