I'm trying to login to a web service using Web Service
authentification. Everything works fine, but when I'm treating the case
where the user enters an invalid user name or password I get an
SoapHeaderException with the error message "The security token could
not be authenticated or authorized"

The problem is I end up with code like this when tryint to catch a bad
username or password:

catch (SoapHeaderException soapEx)
{
 //A SoapHeaderException with this error message means that we have an
invalid login
 if (soapEx.Message == "The security token could not be authenticated
or authorized")
   throw new ArgumentException("Could not logon to the Server. The
UserName or Password is invalid");
 else throw soapEx;
}
catch(Exception ex)
{
 //Normal Logic
}

Is there a better way, i.e that doesn't compare the Message string from
the exception to know that the user name or password we passed along is
invalid?

Thanks