If you use Newonsoft's Json.NET for the .NET environment, you can use its SelectToken implementation to make JSONPath queries of JSON documents. First, you'll parse the JSON into JObject and then make a query.
You'll need to include the Json.NET assembly in your application. To do this, follow the steps in Chapter 7, Using JSON in a Type-safe Manner, in the Getting ready section of the How to Deserialize an object with Json.NET recipe.
Here's how to extract all titles of all books from the example in the introduction and get the first result:
using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json.Linq;
// …
static void Main(string[] args)
{
var obj = JObject.Parse(json);
var titles = obj.SelectTokens("$.store.book[*].title");
Console.WriteLine(titles.First());
}