// Реакция на нажатие кнопки
private void OnSerializeJson(object sender, RoutedEventArgs e)
{
	// Создаем объект для сериализации в JSON
	var product = new Product
	{
		Name = "Apple", 
		Expiry = new DateTime(2008, 12, 28)
	};

	// Сериализация с помощью Newtonsoft.Json 
	// Падает на этой строчке
	string json = JsonConvert.SerializeObject(product);
	// Вывод результата в текстовое поле. В результате должно быть примерно следующее 
	//{
	//  "name": "Apple",
	//  "expiry": "2008-12-28T00:00:00",
	//}	
	Result.Text = json;
}

// Класс продукта, описан с помощью Newtonsoft.Json аннотаций
[JsonObject(MemberSerialization.OptIn)]
public class Product
{
	[JsonProperty("name")]
	public string Name { get; set; }

	[JsonProperty("expiry")]
	public DateTime Expiry { get; set; }
}

Newtonsoft.Json.SerializationException: "Error getting value from 'Name' on 'CryptoProTestApp.Product'."
System.Runtime.InteropServices.COMException: "Такой запрос не поддерживается. (Исключение из HRESULT: 0x80070032)"
StackTrace:
   at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
   at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
   at Newtonsoft.Json.JsonConvert.SerializeObjectInternal(Object value, Type type, JsonSerializer jsonSerializer)
   at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Type type, JsonSerializerSettings settings)
   at Newtonsoft.Json.JsonConvert.SerializeObject(Object value)
   at CryptoProTestApp.MainPage.OnSerializeJson(Object sender, RoutedEventArgs e) in c:\Users\artem_000\Documents\Visual Studio 2012\Projects\CryptoProTestApp\CryptoProTestApp\MainPage.xaml.cs:line 46