You're welcome. :)
I can't think that you're gonna have any performance issue. Still trying to think a little bit more about it: Strings are objects in .NET, therefore they're reference type. Dealing with reference type will always be slower than dealing with value types. When some piece of information is being concatenated only once to a string variable, it can't suffer performance penalties...
anyway, Gurus, where are you?? <s>
Claudio Lassala