>>If you use any other file (not google) do you have the same error?
>
>If I put an invalid file name, such as when I remove the last character, this will not give the error. It is only when the file is specified as if .NET would not like that specific file name.

Ok, I gave up for now, sorry.

I guess this would not help, but just in case:
http://forums.asp.net/t/988110.aspx