How would I go about about using LINQ to JSON in the .net 4 Client Profile in C#. I'd like to query certain json responses as shown in msdn blog post without having to write out a contract (datacontract, servicecontract, etc). I really only need to query(read) the response, I don't need to modify the json response. (Also would a datacontract be faster than LINQ to JSON?)
Alternatively I could use XML or the full .net 4 framework, but I'm hoping that this can be avoided. I can use external libraries if it's better than installing the whole framework.
JSON.net is quite popular and seems to be what you're after.