Turn off auto redirect in HttpWebRequest

I have a POST request, that retu code 302.

string FormParams = "Some_string";
            byte[] SomeBytes = Encoding.UTF8.GetBytes(FormParams);

            HttpWebRequest AuthPost = (HttpWebRequest)WebRequest.Create("https://example.com/");
            AuthPost.Method = "POST";
            AuthPost.AllowAutoRedirect = false;

            AuthPost.Accept = "text/html, application/xhtml+xml, */*";
            AuthPost.Headers["Referer"] = "https://example.com/";
            AuthPost.Headers["User-Agent"] = "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; Touch; ASU2JS; rv:11.0) like Gecko";
            AuthPost.ContentType = "application/x-www-form-urlencoded";
            AuthPost.Headers["Accept-Encoding"] = "gzip, deflate";
            AuthPost.Headers["DNT"] = "1";
            AuthPost.Headers["Coection"] = "Keep-Alive";
            AuthPost.Headers["Cookie"] = savedcookie;
            AuthPost.Headers["Content-Length"] = SomeBytes.Length.ToString();
            AuthPost.Headers["Cache-Control"] = "no-cache";
            Stream postStream = await AuthPost.GetRequestStreamAsync();
            postStream.Write(SomeBytes, 0, SomeBytes.Length);
            postStream.Flush();

            HttpWebResponse AuthPostResponse = (HttpWebResponse)await AuthPost.GetResponseAsync();

So I need manage retued cookie before redirecting. How can I tu off auto redirect or manage cookies?