/// <summary>
        /// deletes the registration of the current user.
        /// </summary>
        public void LogoutUser()
        {
            if (KnownUser)
            {
                SessionContainer.ForceGetNextSSID(UserName);
                Ssid = "";

                if (SessionContainer.SessionIdTransmissionType == SessionContainer.ESessionIdTransmissionType.Cookie)
                {
                    SetCookies.Add(new KeyValuePair <string, string>("ssid", ""));
                }
            }
        }
        /// <summary>
        /// _FORCES_ to get a new SSID for the current user if needed for higher level security (call before building the site)
        /// </summary>
        /// <returns>the new ssid</returns>
        public string ForceGetNextSsid()
        {
            if (!KnownUser)
            {
                throw new Exception("The current user is unknown. Please check for SessionData.knownUser before calling this method.");
            }

            Ssid = SessionContainer.ForceGetNextSSID(UserName);

            if (SessionContainer.SessionIdTransmissionType == SessionContainer.ESessionIdTransmissionType.Cookie)
            {
                SetCookies.Add(new KeyValuePair <string, string>("ssid", Ssid));
            }

            return(Ssid);
        }