C# webclient and proxy server

Question

I am using a web client class in my source code for downloading a string using http.

This was working fine. However, the clients in the company are all connected now

Answer 1

All previous answers have some merit, but the actual answer only needs ONE line:

wc.Proxy = new WebProxy("127.0.0.1", 8888);

where wc is the WebClient object, and 8888 is the port number of the proxy server located on the same machine.