vba on error done and handler code example

Example: vba error handling message

Dim Msg
On Error GoTo errorhandling   ' Defer error handling.
' code goes here, where potential problem occours
errorhandling:
' Check for error, then show message.
If Err.Number <> 0 Then
    Msg = "Error # " & Str(Err.Number) & " was generated by " _
            & Err.Source & Chr(13) & Err.Description
    MsgBox Msg, , "Error", Err.Helpfile, Err.HelpContext
    Err.Clear
End If