Json.NET is a popular high-performance JSON framework for .NET
-Flexible JSON serializer to convert .NET objects to JSON and back again
-LINQ to JSON for manually reading and writing JSON
-Writes indented, easy to read JSON
-Convert JSON to and from XML
-Supports Silverlight and Windows Phone
The JSON serializer is a good choice when the JSON you are reading or writing maps closely to a .NET class. The serializer automatically reads and writes JSON for the class.
LINQ to JSON is good for situations where you are only interested in getting values from JSON, you don't have a class to serialize or deserialize to, or the JSON is radically different from your class and you need to manually read and write from your objects. LINQ to JSON allows you to easily read, create and modify JSON in .NET.
Download Json.NET from CodePlex or install using NuGet
Find guides for getting started and comprehensive API Documentation at http://james.newtonking.com/projects/json/help/
My blog can be found at http://james.newtonking.com
where I post news and updates about Json.NET.
My twitter account can be found at @JamesNK
Json.NET is a free open source project that I have developed in my personal time. I really appreciate your feedback and support for Json.NET and its future development.