Deserialized Object Has All Values Set to Null

in my case it was because of my destination type have internal (or private) set modifiers for those properties .

public class Summary{

     public Class2 Prop1 { get; internal set; }
     public Class1 prop2 { get; set; }

}

after removing internal modifier, json.net deserialize those objects too like the serialization step

Your JSON has an outer object which contains a collection of Key objects. The following code works (I tested it):

    class KeyWrapper
    {
        public List<Key> Keys { get; set; }
    }

    class Key
    {
        public string RegistrationKey { get; set; }
        public string ValidationStatus { get; set; }
        public string ValidationDescription { get; set; }
        public List<Properties> Properties { get; set; }
    }

    public class Properties
    {
        public string Key { get; set; }
        public string Value { get; set; }
    }

    public void DeserializeKeys()
    {            
        const string json = @"{""Keys"": 
            [
                {
                    ""RegistrationKey"": ""asdfasdfa"",
                    ""ValidationStatus"": ""Valid"",
                    ""ValidationDescription"": null,
                    ""Properties"": [
                        {
                            ""Key"": ""Guid"",
                            ""Value"": ""i0asd23165323sdfs68661358""
                        }
                    ]
                 }
             ]
         }";

        var keysWrapper = Newtonsoft.Json.JsonConvert.DeserializeObject<KeyWrapper>(json);
 }