Tomek on Software

Silverlight TV episode about Duplex communication with WCF in Silverlight is beginning to air today. In this episode I am showing how to implement duplex communication with WCF using HTTP polling duplex protocol, as well as discuss aspects of the net.tcp protocol. If you want to find out more about...

WCF traces are very helpful in diagnosing and debugging problems with a deployed WCF service. This post describes how traces generated by a WCF RIA service can be accessed and inspected directly from a web browser in a variety of formats. WCF traces capture information about the lifetime of a...

Silverlight 4 RC that shipped recently at MIX 2010 supports a new mode of the HTTP polling duplex protocol with greatly improved performance compared to the version in Silverlight 3. This post compares the performance of the three mechanisms for asynchronous data push from the server to the client available...

NOTE Many people reading this post are really looking for a publish\subscribe solution for Silverlight to implement a web chat or a stock quote application for the browser, a multiplayer online game, or some form of a web based collaboration tool, among others. If that fits your profile, you may...

Microsoft Silverlight 4 Beta unveiled at PDC 2009 enables Silverlight clients to communicate with a Windows Communication Foundation (WCF) service using the net.tcp protocol. The key benefits of the net.tcp protocol are: support for duplex communication with a simple to use programming model, excellent performance, good integration with the Add...

It has been 8 months since my previous research of the adoption of communication and serialization technologies in Silverlight applications deployed on the web, and a few months since Silverlight 3 shipped in July 2009. In this article I am describing the findings of a follow up research and comparing...

Introduction In my recent articles I have introduced a sample pub/sub application using Silverlight’s HTTP polling duplex protocol, an AJAX client talking the same protocol, as well as discussed server side performance of the protocol. The latter post pointed out scalability challenges associated with deploying a WCF service using the...

Many people notice an apparent degradation of latency of concurrent WCF calls in a Silverlight application compared to a similar code in a Windows Console application. This post explains this phenomenon and shows how to optimize performance of concurrent calls in Silverlight. WCF proxies in Silverlight applications use the SynchronizationContext...

Introduction Silverlight supports a communication protocol that allows a server to asynchronously send messages to a Silverlight client (“push”) using Windows Communication Foundation (WCF) services. This feature is based on a polling duplex (HTTP long polling, or Comet-style) protocol, and ships as two DLLs in the Microsoft Silverlight SDK, both...

This sample shows how an AJAX browser application can receive asynchronous data notifications from a WCF service exposed using the HTTP polling duplex protocol that shipped in Microsoft Silverlight 3. The sample code contains a reusable, standalone JavaScript library (sl3duplex.js) which implements the client side of the polling duplex protocol....