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Where is the code and what do you have written ?

if you add this to ThisWorkBook for example

Private Sub Workbook_Open()
Sheet1.Cells(1, 1).Value = Sheet1.Cells(1, 1).Value + 1
End Sub

It will add a value to the first cell in the workbook and each time the
workbook is opened the value will be incremented by 1.

Mark D

"Andrew" wrote in message
...
Everytime my workbook opens, I want a new number assigned
to a worksheet, simply 1 plus the last number. I keep
getting a circular reference. Any ideas?

Thank you!