// Irgendeine abstrakte Basis, die nebenbei auch die Webheader Collection als statische Variable hält
    public abstract class CoBRAService
    {
        public CoBRAService(string username, string password, string webserviceRootUrl)
        {
            Username = username;
            Password = password;
            BaseService = new CoBRABaseService();
            DmsService = new CoBRADmsService();
            WebserviceRootUrl = webserviceRootUrl;
            SetWebserviceRootUrl(WebserviceRootUrl);
        }

        // STATISCHE VARIABLE IN EINER ABSTRAKTEN KLASSE MÖGLICH?
        public static WebHeaderCollection webHeaderCollection = new WebHeaderCollection();

        public CoBRABaseService BaseService { get; private set; }

        public dmsService DmsService { get; private set; }

        public string WebserviceRootUrl { get; private set; }

        public string Username { get; set; }

        public string Password { get; set; }

        public bool Login()
        {
            try
            {
                CoBRA_BASE.ResultVoid loginResult = BaseService.loginUser(Username, Password);
                double? loginErrorCode = loginResult.errorCode;
                return loginErrorCode == 0;
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                return false;
            }
        }

        protected bool CheckSession(int errorCode)
        {
            bool activeSession = errorCode == 0;

            if (!activeSession)
            {
                BaseService.SetSessionExpired();
                activeSession = Login();
                if (activeSession)
                {
                    BaseService.SetSessionActive();
                }
            }

            return activeSession;
        }

        public bool SetWebserviceRootUrl(string rootUrl)
        {
            bool validRootUrl = false;

            try
            {
                WebserviceRootUrl = rootUrl;
                BaseService.Url = $"{WebserviceRootUrl}/svc/cobra.cfc?wsdl";
                DmsService.Url = $"{WebserviceRootUrl}/svc/dms.cfc?wsdl";
                validRootUrl = true;
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }

            return validRootUrl;
        }
    }