var request = ( HttpWebRequest )WebRequest.Create( "https://plm.programsoyuz.ru/f80ef7a0/login" );
                var postData = string.Format( "login={0}&password={1}", login, password );
                var data = Encoding.ASCII.GetBytes( postData );

                request.Credentials = new NetworkCredential();
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = data.Length;
                request.CookieContainer = new CookieContainer();

                try
                {
                    using( var response = ( HttpWebResponse )request.GetResponse() )
                    {
                        if( response.StatusCode == HttpStatusCode.Moved )
                        {
                            CookieHelper.Cookies.Add( response.Cookies );
                            var webView = FindViewById<WebView>( Resource.Id.WebBrowser );
                            webView.Settings.JavaScriptEnabled = true;
                            webView.SetWebViewClient( new CookieWebViewClient( webView ) );
                            webView.Visibility = ViewStates.Visible;
                            webView.LoadUrl( "https://plm.programsoyuz.ru/f80ef7a0/" );
                        }
                    }
                }
                catch( Exception e )
                {
                    Toast.MakeText( ApplicationContext, e.Message, ToastLength.Short ).Show();
                }