Excel - Copy Paste Columns

Hi there,
i want to prevent users from pasting more than one column at a time in a sheet.

So I put in the following code.

VB Code:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
 
        
    If InStr(1, Target.Address, ":", vbBinaryCompare) Then
        If Sheet1.Range(Target.Address).Columns.Count > 1 Then
            MsgBox "please copy paste one column at at time. our developers are getting tired of this crap"
            Exit Sub
        End If
    End If
End Sub

However the trouble with this is that it doesn't allow me to select multiple columns from the sheet.

How do I distinguish between pasting and selecting?


Cheers,
Abhijit