userform.show before save

Is it possible that when someone tries to save an Excel's workbook, either by clicking on save button or through the File tab, a userform appears and ask for some data fields before actually saving the file?

You should be able to use the workbook_beforesave event in ThisWorkbook for doing that...

Is it possible to cancel the saving? I tried Exit Sub but it doesn't work...

VB Code:

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
Form.Show
If save = 0 Then
    Exit Sub
End If
End Sub

Show the form modally so it holds up code execution in the beforesave event.

VB Code:

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
    Form.Show vbModal
    If save = 0 Then
        Exit Sub
    End If
End Sub