private async static void getsessionToken()
        {
            //logindaten
            string euserver = "virgon";
            string username = "bieg";
            string password = "bug";

            //"roh"-sessionstuff
            //was zum f** ist der pattern
            string pattern_authuser_and_token = @"r'.*action="+ @"https://sas.bpsecure.com/Sas/Authentication/Bigpoint\?authUser=(\d+)&token=([a-zA-Z0-9-_]*)'";
            string mainrequest = $"https://{euserver}.bsgo.com/";

            //webrequest
            HttpClient client = new HttpClient();
            HttpResponseMessage response = await client.GetAsync(mainrequest);
            HttpContent content = response.Content;
            string mycontent = await content.ReadAsStringAsync();
            foreach (string line in mycontent.Split('\n'))
            {
                if (line.Contains("token"))
                {

                    Match matches = Regex.Match(pattern_authuser_and_token, line);
                    Group authUser = matches.Groups[1];
                    Group token = matches.Groups[2];


                    using (StreamWriter sw = new StreamWriter(@"mytest.txt", true))
                        sw.WriteLine(line);


                    var headers = "Content-Type" + "application/x-www-form-urlencoded";

                    string url = $"https://sas.bpsecure.com/Sas/Authentication/Bigpoint?authUser={authUser}&token={token}";


                    List<KeyValuePair<string, string>> queries = new List<KeyValuePair<string, string>>()
                    {
                        new KeyValuePair<string, string>($"username{username}",$"password{password}")
                    };

                    HttpContent loginrequest = new FormUrlEncodedContent(queries);


                    using(HttpClient client2 = new HttpClient())
                    {
                        using (HttpResponseMessage login = await client2.PostAsync(url, loginrequest))
                        {
                            using(HttpContent content2 = login.Content)
                            {
                                string mycontent2 = await content2.ReadAsStringAsync();
                                using (StreamWriter sw = new StreamWriter(@"mytest.txt", true))
                                    sw.WriteLine(mycontent2);
                            }
                        }
                    }

                }

            }

        }