WebSocket Handler

 Separate Open and Message and use Collection to Broadcast
   public class JsonWebSocketHandler : WebSocketHandler
    {

        WebSocketCollection _wsCns = new WebSocketCollection();
        public override void OnMessage(string message)
        {
            JavaScriptSerializer ser = new JavaScriptSerializer();
            _wsCns.Broadcast(ser.Serialize( new
                {
                    data="Test",
                    id=1
                }));
        }

        public override void OnOpen()
        {
            _wsCns.Add(this);
        }
    }

IHttpHandler can inject WebSocketHanldler (Extension Method for Context)

     public void ProcessRequest(HttpContext context)
        {
            if (context.IsWebSocketRequest)
            {
                context.AcceptWebSocketRequest(new JsonWebSocketHandler());
            }
        }

JavaScript also need to separate Open and Send

    $(function () {
        var cn = new WebSocket("ws://localhost/TestJsonWebSocket/jswsh.ashx");
        $("#b").click( function () 
        {
            cn.onmessage = function (msg) {
                alert(msg);
            }
        });

        $("#b2").click(function () {
            cn.send(window.JSON.stringify({ type: 1 }));
            }
        );
        
    });