public string GetAllOnlineUsers() { JSonResult result = new JSonResult(); result.Status = false; List<OnlineUser> onlineUsers = new List<OnlineUser>(); Chat chat = new Chat(); List<OnlineUser> ou = new List<OnlineUser>(); DataSet allUsersDataset = chat.GetAllOnlineUsers(); foreach (DataRow dr in allUsersDataset.Tables[0].Rows) { onlineUsers.Add (new OnlineUser(dr[0].ToString(), dr[1].ToString())); ou.Add(new OnlineUser(dr[0].ToString(), dr[1].ToString())); } result.Status = true; JavaScriptSerializer serializer = new JavaScriptSerializer(); string jsonresult = serializer.Serialize(ou); return jsonresult; }