Guys,
Every now and then I see questions about communicating with web services and really haven't seen any examples that includes both the client and server side. I have created a sample project that includes a sample iOS app, a common data model library (with sample data from http://xamarin.com/university) and an ASP.Net Web API project. These were all created using VS 2013 (with a MAC as the build host). While there are various ways to communicate with web services, this example uses .NET and communicates with the Web API using Json with the help of Json.NET.
Let me know what you guys think of the example and hope it helps someone out. :)
https://github.com/dannycabrera/iOS.WebServiceExample