public static async Task<bool> SendMailFriendRequest(FriendRequestEmail data)
        {
            try
            {
                var client = new SmtpClient();
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                client.EnableSsl = true;
                var supportEmail = ConfigurationManager.AppSettings["CUSTOMER_SUPPORT_EMAIL_SENDER"];
                var displayName = ConfigurationManager.AppSettings["CUSTOMER_SUPPORT_EMAIL_NAME"];
                //var email_temp = ConfigurationManager.AppSettings["CUSTOMER_SUPPORT_EMAIL_SENDER_TEST"];

                var from = new MailAddress(supportEmail, displayName);
                var to = new MailAddress(data.to_email);
                var mailMessage = new MailMessage(from, to)
                {
                    Subject = "You have a friend request!",
                    Body = GetEmailBody(ConfigurationManager.AppSettings["FriendRequestTemplate"], data),
                    IsBodyHtml = true
                };
                await client.SendMailAsync(mailMessage);
                return true;
            }
            catch
            {
                return false;
            }
        }
        public async Task<ActionResult> AddFriend(string friend)
        {
            var param = HttpContext.Request.Params;
            var friendName = string.IsNullOrEmpty(friend)
                ? string.Empty
                : friend.ToLower().Trim('"');

            var api = GoPlayApi.Instance;
            var userFriend = api.GetUserByUserName(friend).Data;

            if (userFriend == null)
                return Json(new { success = false });

            //TODO: add friend to chat system of SignalR later,need to apply new code 3/9

            string gtokenSession = HttpContext.Session["gtoken_section"] == null
                ? string.Empty
                : HttpContext.Session["gtoken_section"].ToString();

            bool isSendRequest = api.SendRequest(gtokenSession, CurrentUser.Id, userFriend.id, null);
            if (isSendRequest)
            {
                string rootUrl = Request.Url.AbsoluteUri.Replace(Request.Url.PathAndQuery, String.Empty);
                var template = new FriendRequestEmail
                {
                    receiver_display_name = userFriend.GetDisplayName(),
                    to_email = userFriend.email,
                    sender_display_name = CurrentUser.GetDisplayName(),
                    sender_avatar = CurrentUser.avatar_filename,
                    sender_username = CurrentUser.UserName
                };
                await EmailHelper.SendMailFriendRequest(template);
            }

            return Json(new
            {
                success = string.IsNullOrEmpty(gtokenSession)
                 ? false
                 : isSendRequest
            });
        }