[DotNetDevelopment] Question about Try Catch statements with multiple catch (VB.Net)

[OliE]

Hi all,

my co-worker and I had an argument about try catchs, so I thought
about asking everyone here since I can't find an answer over my
internets :P

I found something I find weird in one of his try catch in his code.
Instead of having multiple catch of different error types, he made
this :

        Catch ex As Exception
            If ex.Message = "IOException" Then
                MsgBox("Communication Error")
            Else
                MsgBox(ex.Message) 'ex.Message
            End If

I told him no to do so and use multiple catchs like this :

        Catch exIO As IO.IOException
            MsgBox("Communication Error")

        Catch ex As Exception
            MsgBox(ex.Message)

But he is sure his method is faster / resource friendly than mine,
while I think comparing strings takes longer than catching directly
the exception.

So, who's right ?

Thanks for future anwsers and please excuse my english, my main
language is french :)