An easy to use JSON serializer/deserializer. Requires the assembly reference of 'System.Runtime.Serialization'.

JsonUtil.cs

using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;

public static class JsonUtil
{
    /// <summary>
    /// Serializes an object to the respectable JSON string.
    /// </summary>
    public static string Serialize<T>(T o)
    {
        var s = new DataContractJsonSerializer(typeof(T));
        using (var ms = new MemoryStream())
        {
            s.WriteObject(ms, o);
            return Encoding.UTF8.GetString(ms.ToArray());
        }
    }
    /// <summary>
    /// Deserializes a JSON string to the specified object.
    /// </summary>
    public static T Deserialize<T>(string json)
    {
        var s = new DataContractJsonSerializer(typeof(T));
        using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
        {
            return (T)s.ReadObject(ms);
        }
    }
}