2.3.4. Add Or Remove Connection From Groups

• 1.Create a join method in hub:

        public void join(string group)
        {
            //join group
            Groups.Add(Context.ConnectionId, group);
            //remove group
            //Groups.Remove(Context.ConnectionId, group);
        }

• 2.Call join method in client side:

                    $.connection.hub.start().done(function () {
                        obj.server.join(g);
                        $("#send").click(function () {
                            obj.server.servermethod($("#name").html(), $("#msg").val());
                            console.log($("#msg").val());
                     });