Before obfuscation, the call to the webservice works like a charm.
After obfuscation i get this error.
Method obfuscatedText.GetStringFromWebService can not be reflected. There was an error reflecting ".
What could i do? Why do i get this error after obfuscation?
Assuming you actually need to obfuscate the web service code, consider splitting the service into two parts: one part would only be the service contract (or the WebMethods if you're still using ASMX).
All the real work should be split out into a separate assembly. You can obfuscate that separate assembly in order to hide details of your implementation. But leave the "service layer" assembly untouched.