This file, C#.zip, forms a self-contained example of what you need to do to send and receive texts using C#.
This C# example is based upon the ASP.Net platform, and a Web Server with support for ASP.Net 3.5 support is required. The examples were built using SharpDevelop and the .NET Framework 3.5, although it should be simple to convert the code to use an earlier version. MS VisualStudio can also be used to build the solution.
The example contains two projects: one for sending text messages and one for receiving, each with a web form interface.
All you need to do is to download the ZIP file, and build the project. When the files are compiled and deployed to a webserver, simply invoke the web page and a text message will be sent.
We're very keen that your integration should be straightforward and easy, so if you're having any trouble at all, then please don't hesitate to get in touch.