public void SetUserToken(string value)
 {
     if (string.IsNullOrWhiteSpace(value) == true)
     {
         value = null;
     }
     this.GetSession()[SessionKeys.ForUserToken()] = value;
 }
        public string GetUserToken()
        {
            var token = this.GetSession()[SessionKeys.ForUserToken()] as string;

            if (string.IsNullOrWhiteSpace(token) == true)
            {
                return(null);
            }
            else
            {
                return(token);
            }
        }