public async void GetInvites() { List <string> fr = new List <string>(); foreach (var x in friendsService.InvitesGet(new PersonDTO() { Login = User.Identity.Name })) { fr.Add(x.Inviter_Login); } Response.ContentType = "application/x-www-form-urlencoded"; await Response.WriteAsync(JsonConvert.SerializeObject(fr, new JsonSerializerSettings { Formatting = Formatting.Indented })); }