Deserialize ESRI Geocode JSON Response to your Class using  DataContractJsonSerializer.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;

using System.Runtime.Serialization;

using System.ServiceModel.Web;

using System.Runtime.Serialization.Json;

using System.IO;

namespace SynchronusTest

{

    class serializerClass

    {

        public geocoder FromJSON(string jsonResponse)

        {

            geocoder what = new geocoder();

            what = Deserialize( jsonResponse); 

            return what;

        }

        private static T Deserialize(string json)

        {

            var instance = Activator.CreateInstance();

            using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(json)))

            {

                var serializer = new DataContractJsonSerializer(instance.GetType());

                return (T)serializer.ReadObject(ms);

            }

        }

    }

    [DataContract]

    public class geocoder

    {

        [DataMember(Name = "spatialReference")]

        public spatialReference spatialReference { get; protected set; }

        [DataMember(Name = "candidates")]

        public List candidates { get; protected set; }

    }

    [DataContract]

    public class Whatever

    {

        [DataMember(Name = "address")]

        public string address { get; protected set; }

        [DataMember(Name = "score")]

        public string score { get; protected set; }

        [DataMember(Name = "attributes")]

        public string attributes { get; protected set; }

        [DataMember(Name = "location")]

        public location location { get; protected set; }

    }

    [DataContract]

    public class spatialReference

    {

        [DataMember(Name = "wkid")]

        public int wkid { get; protected set; }

    }

    [DataContract]

    public class location

    {

        [DataMember(Name = "x")]

        public double x { get; protected set; }

        [DataMember(Name = "y")]

        public double y { get; protected set; }

    }

}

Usage

SynchronusTest.serializerClass deserializerTest = new SynchronusTest.serializerClass();

string Json = @"{""spatialReference"" : {""wkid"" : 4326},""candidates"" : [{""address"" : ""Rochester, Ab"",""location"" : {""x"" : -113.46582113964837,""y"" : 54.36887554118249},""score"" : 68,""attributes"" : { }}]}";

deserializerTest. FromJSON (Json);