SQL Server 2005 - CLR Methode Cannot return Varchars

I have a written a dll in 2.0 that calls a webservice.
This webservice is used to authenticate users in Active Directory. I created a assembly to that calls this dll because of the diverse languages versions that will use it (from asp,vb6 on up) and all can get values from a stored procedure that calls that assembly. I works great. Until now, I have to add another function to my dll that calls the webservice and returns the Users Full name from Active directory for electronic signitures. Okay I added to the dll then tried to reconstruct my Assembly and stored procedures and recieved the following error. "CREATE PROCEDURE failed because a CLR Procedure may only be defined on CLR methods that return either SqlInt32, System.Int32, void"
I want to keep all these Active directory call all in one place so I can be consistant in all the different applications. I was reading about UDF but that could get messy as I have a config file for the dll that allows the user to dynamically change the url for the webservice. Any suggestions/help will be greatly appreciated