C＃ - HTTPWebRequest保留会话（或cookie？）

Question

我很难保存会话或者在我的代码中可以调用的任何内容。有人可以帮帮忙吗？这是代码的一部分：

    public void dOR()
    {
        HttpWebRequest rr = (HttpWebRequest)WebRequest.Create("https://www.deviantart.com/users/login");
        string post_data = "ref=https%3A%2F%2Fwww.deviantart.com%2F&username=user&password=pass&remember_me=1";
        rr.ContentType = "application/x-www-form-urlencoded";
        rr.Method = WebRequestMethods.Http.Post;
        rr.AllowAutoRedirect = true;
        byte[] array1 = Encoding.ASCII.GetBytes(post_data);
        rr.ContentLength = array1.Length;
        Stream newStream = rr.GetRequestStream();
        newStream.Write(array1 , 0, array1 .Length);
        newStream.Close();

        HttpWebResponse resp = (HttpWebResponse)rr.GetResponse();
        using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
        {
            string sourceCode = sr.ReadToEnd();
            textBox1 .Text  = sourceCode;
        }
    }

现在 - 如何让程序保持在会话中？比如，该网站仍然识别我登录的帐户？

我可以将它合并到私有方法中，例如：

    private void button1_Click(object sender, EventArgs e)
    {
        //Send a request again, but preserve the session.
    }

非常感谢你们！