csrfmiddlewaretoken "7e9001a3c0000f11099c11h119745e30"
username    "логин"
password    "пароль"
next    "/about/"

WebResponse Response;
HttpWebRequest Request;
Uri url = new Uri("http://00.00.00.000:0000/accounts/login/");
CookieContainer cookieContainer = new CookieContainer();

Request = (HttpWebRequest)WebRequest.Create(url);
Request.Method = "GET";
Request.CookieContainer = cookieContainer;
Response = Request.GetResponse(); //1 раз получил csrfmiddlewaretoken

string Parametros = "csrfmiddlewaretoken=" + cookieContainer.GetCookies(url)["csrftoken"].Value + "&username=логин&password=пароль&next=/about/";

Request = (HttpWebRequest)WebRequest.Create(url);
//вот тут получается мне выдадут потом новый токен, а без использования этого я не знаю как сформировать новый запрос
Request.Method = "POST";
Request.ContentType = "application/x-www-form-urlencoded";
Request.CookieContainer = cookieContainer;
Request.Headers.Add("Cookie", Response.Headers.Get("Set-Cookie"));
byte[] byteArray = Encoding.UTF8.GetBytes(Parametros);
Request.ContentLength = byteArray.Length;
Response = Request.GetResponse();