i have done like this

        function updateNotificationCount() {
           
                value = $("#connlbl").text();
                alert("value: " + value)
                $.ajax({
                    type: "POST",
                    url: "/LetsChat/GetOnlineusers?connid=" + value,
              
                    contentType: "application/json; charset=utf-8",
               
                    dataType: "json",
                    success: function (response) {
                        debugger;
                        $('#notiContent').empty();
                        if (response.length == 0) {
                            $('#notiContent').append($('<li>Currently You Have No New users.</li>'));
                        }
                        for (var i = 0, len = response.length; i < len; i++) {
             
                            $('#notiContent').append('<strong>'+ (i+1) + "<a  onclick=getValue(this); href='#'>" + response[i].ContextID + "</a>" + "   " + response[i].Name + "<BR>");
                          //  $('#online').append('<strong>' + "<a  onclick=getValue(this); href='#'>" + userid + "</a>" + "   " + username + "<BR>");


                        }
                        $.each(response, function (index, value) {
                          
                           // $('#notiContent').append($('<li>The User: , ' + value.Name + '&nbsp;' + 'Of ID' + ' (' + index.ContextID + ') Is Written Something.</li>'));
                        });
                    },
                    error: errorFunc
                });
            }

  [HttpPost]
        public JsonResult GetOnlineusers(string connid)
        {
            NotificationComponent nc = new NotificationComponent();
            var list = nc.GetData(connid);


            return new JsonResult { Data = list, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
        }

    public List<users> GetData(string ExcludeConnectionid)
        //public List<users> GetData(DateTime afterDate)

        {

            ExecuteTsql ex = new ExecuteTsql();
            DataSet ds = new DataSet();

            //ds=  ex.SelectQueryDS("SELECT *   FROM[LetsChat].[dbo].[users] where [AddedOn]>"+"'"+  afterDate+"'");
            ds = ex.SelectQueryDS("SELECT *   FROM[LetsChat].[dbo].[users] where contextid!="+"'" + ExcludeConnectionid +"'");

            
       //   var notificationHub = GlobalHost.ConnectionManager.GetHubContext<LetsChatHub>();
        //  var data =   notificationHub.Clients.All.showMessage();
           // await this.notificationHub.Clients.All.InvokeAsync("GetConnections");
           
            
            var userList = ds.Tables[0].AsEnumerable().Select(dataRow => new users { Name = dataRow.Field<string>("Name") , ContextID = dataRow.Field<string>("ContextID") }).ToList();
            return userList;
           
        }