Please check out my blog post with release details.

Just blogged how to implement an active federation flow from Silverlight using WS-Trust and WIF. However it uses simple HTTPS not strong crypto…

Our cutomer Chris Bardon just published his thoughts on how to simplify callback management in duplex services, you can check out his thoughts here . Thanks Chris!

The extensibility interfaces (IClientMessageFormatter, IClientMessageInspector, IParameterInspector) added in Silverlight 4 were a great addition and enabled many scenarios that were, if not impossible, quite hard to accomplish before. But for applications...

Unlike in the desktop framework, Silverlight doesn't have a good extensibility point for replacing the serializer which is used to serialize / deserialize operation parameters (since the class DataContractSerializerOperationBehavior is not public in SL4...

Just published a blog post on how to host WCF NetTcp services in Windows Azure and use them from a Silverlight client. Check it out here!

You may have built a federated auth app with RIA Services, but it always required cumbersome browser redirects. Check out this new sample that shows how to do federated auth with with WIF, all from inside the Silverlight app. Hope this is useful, ...

Just posted a sample about how to use the T4 code-generation template support in RIA Services V1 SP1 in order to copy comments over from my server project to my Silverlight project, check it out here . Thanks, -Yavor Georgiev Program Manager, WCF

A while ago we shared a workaround for accessing some ASMX services (including SharePoint's UserProfileService) from Silverlight 4 . Unfortunately that workaround does not work for Silverlight 3 and Windows Phone 7 applications. Here is a new post which...

Some customers are reporting on the Silverlight forums that they are unable to have a functional PollingDuplexHttpBinding setup, or their current polling duplex client have faulted channels. This behavior is a regression introduced in SL4 GDR1 and is...

Thanks to everyone who joined us for the WCF and WCF RIA Services talks today at the Silverlight Firestarter. I’m glad our talks went well and I’ll update this post with links to the video, slides, and demos once they are available. UPDATE: You can find...

Today we are announcing the first release of WCF Web APIs on wcf.codeplex.com , just in time for PDC 2010. There has already been some buzz about WCF investments in HTTP and Web technologies , and today is the day. If you haven’t had a chance to watch...

Here is a little code snippet that shows how to work with WebOperationContext for HTTP responses in Silverlight WCF proxies. Hope it helps! -Yavor Georgiev Program Manager, WCF

Hi folks – check out this new SilverlightTV video, going over some of the common errors you may encounter when using WCF services from Silverlight: Silverlight TV 46: What's Wrong with my WCF Service? Direct link Cheers, -Yavor Georgiev Program Manager...

If any of you have used RIA Services and tried to get that to work with the WCF router, you probably encountered some problems. The router could be useful in a DMZ scenario, or if you are trying to do content-based routing. I just blogged a quick sample...

As part of our ongoing experimentation with the HTML5 WebSocket proposed standard for duplex communication between web browsers and servers, we have prototyped a WebSocket protocol implementation based on Microsoft technologies. The prototype consists...

With the new transport (TCP) added in SL4, and a few people started asking how to serve the cross-domain policy file if the TCP service is self-hosted (like the same issue for cross-domain calls to self-hosted HTTP services). I published a new post to...

It appears that MSDN’s new blog engine has started more aggressively marking comments for moderation. I started getting suspicious at not receiving any comments on our posts, so I checked and it turned out there was a huge queue of comments waiting to...

The new MultipleMessagesPerPoll mode added to PollingDuplex in Silverlight 4 , comes with some new timeouts , so I thought it would be useful to post a detailed description of how those work. Unfortunately this is not currently covered by our documentation...

Carlos, one of my teammates responsible for WCF support in Silverlight, just posted a code sample showing how to do file downloads from Silverlight using a WCF service. The key here is that it uses HTTP chunking (or streaming) on a single response to...

I would like to invite you to review, download, use, tweak, and provide feedback for an experimental project we launched at Codeplex: Laharsub ( http://laharsub.codeplex.com ). We have been getting comments and observing the dominant use case scenarios...

Sometimes as a team we get carried away trying to add new features to the product, when we should actually focus on improving the usability of existing features from previous releases. I’ve put together a list of WCF pain points that we are aware of based...

One of the new features in the WCF stack in Silverlight 4 is an improvement of our PollingDuplex binding, which allows duplex communication over HTTP. HTTP is a request/reply communication medium, so some tricks are needed to make it look like a duplex...

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...

On this blog we normally talk about building and accessing WCF services, since that is the recommended way to build services for Silverlight. However, we continue to support ASMX services using the familiar “Add Service Reference” feature. Just recently...