Restful web service is easy you can do it by any programming language also Javascript. try
0) use HTTP classes to send request to webservice with specified parameters
1) get results from response
2) use a lib or API for JSON in .Net, for you can parse results
3) use parsed data
try to read
Accessing Services Using Browsers you can do something like it with C#. &
JSON.Net (maybe you can found JSON Request for .Net)