using System;

using System.Web;

using System.Net.Http;

public class Program

{

    public static void Main()

    {

        using (var client = new HttpClient("http://rt.site.com/REST/1.0/"))

        {

            client.TransportSettings.Cookies = new CookieContainer();

​

            var form = new HttpUrlEncodedForm();

            form.Add("user", "LOGIN");

            form.Add("pass", "PASSWORD");

​

            client.Post(string.Empty, form.CreateHttpContent());

​

            // 1. Get ticket data

            using (var request = client.Get("ticket/1234/show"))

            {

                string content = request.Content.ReadAsString();

                // Some logic

            }

​

            // 2. Post ticket reply with attachment

            var formPost = new HttpMultipartMimeForm();

            byte[] attachment = new byte[];

            string content = string.Empty;

​

            // Store data in attachment

            // Store data in content string ("Field: Value" line by line)

            // ...

​

            formPost.Add("content", content);

            formPost.Add("attachment_1", "attachment_1", HttpContent.Create(attachment, "application/octet-stream"));

​

            using (var post = client.Post("ticket/1234/comment"), formPost.CreateHttpContent()))

                // Some logic

        }

    }

}