I keep getting the following message:
"Unable to set the LeftHeader property of the PageSetup class". I'm trying
to reference a cell value in the header with the following
WorkBook_BeforePrint event code:

Private Sub Workbook_BeforePrint(Cancel As Boolean)
Worksheets("1").PageSetup.LeftHeader = "&""Arial,Bold""Client No. " &
Worksheets("1").Range("ClientNum1").Value
Worksheets("2").PageSetup.LeftHeader = "&""Arial,Bold""Client No. " &
Worksheets("2").Range("ClientNum2").Value
Worksheets("3").PageSetup.LeftHeader = "&""Arial,Bold""Client No. " &
Worksheets("3").Range("ClientNum3").Value
End Sub

The print precedure (partial) is:

Sub Test()
Worksheets("1").Range("Page1").PrintOut
End Sub

The WorkBook_BeforePrint event fails when I call the Test procedure. Why??
When I print preview, it assigns the range value to the header properly,
which tells me the WorkBook_BeforePrint code is correct.

Please note that I have named my sheets numbers