Check out example codes for "c# webrequest cookies". It will help you in understanding the concepts better.

Code Example 1

CookieContainer cookieContainer = new CookieContainer();
                            System.Net.Cookie userNameCookie = new System.Net.Cookie("user", "username");
                            System.Net.Cookie passwordCookie = new System.Net.Cookie("password", "9848jf7s7ejhd");
                            cookieContainer.Add(userNameCookie);
                            cookieContainer.Add(passwordCookie);

                            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(produkt);
                            request.CookieContainer = cookieContainer;
                         //multiple cookies.

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