JavaScriptSerializer is a good option. This is in the .NET Framework v3.5, so you will not need any third-party library.
Here is a small example of how you can use it, although if you introduce JavaScriptSerializer on Google, you will have many examples of how to parse it.
Basically, you need to determine the type that matches the JSON format you need to parse and use the Deserialize method of the JavaScriptSerializer class.
Edit:
See @ Marc Gravell answer for a similar question: JSON parsing using Json.net
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