gistfile1.cs

public class JsonContent : StringContent
{
    public JsonContent(object contentObject) : base(JsonConvert.SerializeObject(contentObject), Encoding.UTF8, "application/json") {}
    public JsonContent(string content) : base(content) {}
    public JsonContent(string content, Encoding encoding) : base(content, encoding) {}
    public JsonContent(string content, Encoding encoding, string mediaType) : base(content, encoding, mediaType) {}
}