The JavaScriptSerializer.Deserialize<T>(input) method attempts to deserialize a string of valid JSON into an object of the specified type <T>, using the default mappings natively supported by JavaScriptSerializer.

using System.Collections;
using System.Web.Script.Serialization;

// ...

string rawJSON = "{\\"Name\\":\\"Fibonacci Sequence\\",\\"Numbers\\":[0, 1, 1, 2, 3, 5, 8, 13]}";

JavaScriptSerializer JSS = new JavaScriptSerializer(); 
Dictionary<string, object> parsedObj = JSS.Deserialize<Dictionary<string, object>>(rawJSON);

string name = parsedObj["Name"].toString();
ArrayList numbers = (ArrayList)parsedObj["Numbers"]

Note: The JavaScriptSerializer object was introduced in .NET version 3.5