/// <summary>
        /// Добавление пользователю группы по USER_ID пользователя
        /// и по ACCESSGROUP_ID группы
        /// </summary>
        /// <param name="user_id"></param>
        /// <param name="accessgroup_id"></param>
        /// <returns></returns>
        public void AddUserInAccessGroup(Int64 user_id, Int64 accessgroup_id)
        {
            using (SecurityDBEntities db = new SecurityDBEntities())
            {
                UsersInAccessGroups userinaccessgroup = new UsersInAccessGroups();
                userinaccessgroup.USER_ID = user_id;
                userinaccessgroup.ACCESSGROUP_ID = accessgroup_id;

                db.AddToUsersInAccessGroups(userinaccessgroup);
                db.SaveChanges();
            }
        }
        /// <summary>
        /// Добавление пользователю группы по логину пользователя
        /// и по ACCESSGROUP_ID группы
        /// </summary>
        /// <param name="user_login"></param>
        /// <param name="accessgroup_id"></param>
        /// <returns></returns>
        public void AddUserInAccessGroup(String user_login, Int64 accessgroup_id)
        {
            using (SecurityDBEntities db = new SecurityDBEntities())
            {
                long user_id = (from u in db.Users where (u.LOGIN == user_login) select u.USER_ID).First();

                UsersInAccessGroups userinaccessgroup = new UsersInAccessGroups();
                userinaccessgroup.USER_ID = user_id;
                userinaccessgroup.ACCESSGROUP_ID = accessgroup_id;

                db.AddToUsersInAccessGroups(userinaccessgroup);
                db.SaveChanges();
            }
        }