Deserialized Values always return null - RestSharp Get request

In order to get the data deserialized into strongly typed objects the object hierarcy should match properly. But the given sample of JSON looks like generated on the fly with some encoded objects under root element. I think you can use the Dynamic deserialization to get the nested objects with out creating un-necessary types in order to parse JSON.

In order to give you resolution or a quick guidance. I'm going to use the json.net with ExpandoObject.

I'll simply be using the JObject method to parse the sample json given in the question. In real scneario if you have Array of such object than you could use JArray. The JObject parse any string json provided to JObject. But JObject can not be directly casted into ExpandoObject so I'm using a quick fix for that from the source here. Below is the method that will do the needful to convert JObject to ExpandoObject.

public static object ConvertJTokenToObject(JToken token)
        {
            if (token is JValue)
            {
                return ((JValue)token).Value;
            }
            if (token is JObject)
            {
                ExpandoObject expando = new ExpandoObject();
                (from childToken in ((JToken)token) where childToken is JProperty select childToken as JProperty).ToList().ForEach(property =>
                {
                    ((IDictionary<string, object>)expando).Add(property.Name, ConvertJTokenToObject(property.Value));
                });
                return expando;
            }
            if (token is JArray)
            {
                object[] array = new object[((JArray)token).Count];
                int index = 0;
                foreach (JToken arrayItem in ((JArray)token))
                {
                    array[index] = ConvertJTokenToObject(arrayItem);
                    index++;
                }
                return array;
            }
            throw new ArgumentException(string.Format("Unknown token type '{0}'", token.GetType()), "token");
        }
    }

Now to parse your JSON first simpley call the parser on provided JSON.

 dynamic result = JObject.Parse(JsonDataTest.SampleJson);
 var expando = ConvertJTokenToObject(result) as IDictionary<string, object>;

Now as you can see I'm casting the returned ExpandoObject to IDictionary. This is how the ExpandoObject is implemented it give you a key value store for properties and values. And all the values on each node is of type ExpandoObject.

Now find the items in the Store collection of Expando object.

 List<SingleCardDetails> cardDetails = new List<SingleCardDetails>();
        foreach (var item in expando)
            {
                if (item.Value is ExpandoObject)
                {
                    var store = item.Value as IDictionary<string, object>;
                    // check properties are on first level
                    if (!store.Keys.Contains("bizcardData")) 
                    {
                        cardDetails.Add(TryGetData(store));
                    }
                    else // check second level where contact details are under bizcardData
                    {
                        foreach (var level2 in item.Value as IDictionary<string, object>)
                        {
                            if (level2.Value is ExpandoObject)
                            {
                                var storeLevel2 = level2.Value as IDictionary<string, object>;

                                cardDetails.Add(TryGetData(storeLevel2));
                            }
                        }
                    }
                }
            }

TryGetData() method -

 private static SingleCardDetails TryGetData(IDictionary<string, object> store)
        {
            object name;
            object company;
            object designation;
            object email;
            object phone;

            store.TryGetValue("name", out name); 
            store.TryGetValue("company", out company);
            store.TryGetValue("designation", out designation);
            store.TryGetValue("email", out email);
            store.TryGetValue("phone", out phone);

            return new SingleCardDetails
                        {
                            Name = Convert.ToString(name),
                            Company = Convert.ToString(company),
                            Email = Convert.ToString(email),
                            Designation = Convert.ToString(designation),
                            Phone = Convert.ToString(phone)
                        };
        }

This will parse the given sample and returns two objects of SingleCardDetails.

Note:This is not optimized code and have many areas to improve. But it should give you the directions how to proceed towards the solution.

E.g. This can be optimized to find items with recursive approach avoiding multiple loops and conditional statements. Optimize this as you may.