Terminate Entire Subroutine

I understand that I can use "Exit Sub" to terminate an subroutine. However,this does not prevent everything before the "Exit Sub" from processing and displaying. Now, if I can't determine if a certain condition is met or not met until later in the subroutine, how can I prevent any parts of the code from displaying?

For example:

Code:
Sub XYZ
Response.Write "Table Header"
For 0 to all user's online
If user's page is an product page, then
Response.Write Page_Name
Y = Y + 1
end if
next

If Y <> "" then
Exit Sub
End if
End Sub