What is Json.NET

Json.NET is a popular high-performance JSON framework for .NET

Features
-Flexible JSON serializer to convert .NET objects to JSON and back again
-LINQ to JSON for 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.

For situations where you are only interested in getting values from JSON, 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 then LINQ to JSON is what you should use. LINQ to JSON allows you to easily read, create and modify JSON in .NET.

For Documentation
Quick Starts & API Documentation - http://james.newtonking.com/projects/json/help/.

For Download pls visit the below link
http://json.codeplex.com/