How to login a user to a website using HttpWebRequest and HttpWebResponse

string AuthenticationUrl = "{0}://{1}/exchweb/bin/auth/owaauth.dll";
        string RequestContentType = "application/x-www-form-urlencoded";
        string RequestMethod = "POST";
        string PostData = "destination={0}&flags=0&username={1}\\{2}&password={3}&SubmitCreds=Log On&forcedownlevel=0&trusted=0";
        string scheme = "https";
        string destination = "https://url/exchange";
        string usernameDomain = "domain";
        string password = "password";
        string host = "host";
        string userName = "username";
 
 
        Uri serverUri = new Uri(string.Format(AuthenticationUrl, scheme, host));
 
        HttpWebRequest webRequest = WebRequest.Create(serverUri) as HttpWebRequest;
 
        CookieContainer owaCookies = new CookieContainer();
 
        webRequest.CookieContainer = new CookieContainer();
        webRequest.ContentType = RequestContentType;
        webRequest.Method = RequestMethod;
        webRequest.KeepAlive = true;
        webRequest.AllowAutoRedirect = false;
 
        byte[] body = Encoding.UTF8.GetBytes(string.Format(PostData, destination, usernameDomain, userName, password));
 
        webRequest.ContentLength = body.Length;
 
        using(Stream stream = webRequest.GetRequestStream())
        {
            stream.Write(body, 0, body.Length);
        }
 
        using (HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse)
        {
            foreach (Cookie aCookie in webResponse.Cookies)
            {
                owaCookies.Add(new Cookie(aCookie.Name, aCookie.Value, aCookie.Path, aCookie.Domain));
            }
        }
 
        webRequest = WebRequest.Create("https://mailurl/exchange/") as HttpWebRequest;
        webRequest.CookieContainer = owaCookies;
        webRequest.ContentType = RequestContentType;
        webRequest.Method = "GET";
        webRequest.KeepAlive = true;
        webRequest.AllowAutoRedirect = false;
 
        StreamReader responseStream = new StreamReader(webRequest.GetResponse().GetResponseStream());
 
        string responseData = responseStream.ReadToEnd();
 
        Response.Write(responseData);

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