Silverlight Web Services Team

Everything about WCF and web services support in Silverlight

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  • Blog Post: Some notes on PollingDuplex callback management

    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!
  • Blog Post: PollingDuplex using MultipleMessagesPerPoll issue in latest SL4 GDRs

    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 visible when the following conditions are put together...
  • Blog Post: PollingDuplex multiple mode timeouts demystified

    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 , which is something we are looking to address...
  • Blog Post: HTTP duplex messaging improvements in Silverlight 4

    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 transport, where both the client and the server...
  • Blog Post: Fiddler inspector for WCF Silverlight Polling Duplex and WCF RIA

    Fiddler is a wild popular tool for web development debugging. It enables user to look at the http traffic and diagnoses issues. Natively it provides Raw, Hex, Xml and some other views that understand specific formats. For the format it doesn’t understand, it provides an Inspector plugin model that...
  • Blog Post: The case of null httpcontext.current.session

    Because of un-addressable client in SL, we introduced Polling Duplex channel to support callback in WCF Silverlight. It started as a channel in Silverlight2. We added service model support in Silverlight3 and MultipeMode, aka chunking in Silverlight4. See MSDN for more information about how to use it...
  • Blog Post: Tracing PollingDuplex in Silverlight 4

    Did you know it is now easier to debug the server side PollingDuplex in Silverlight 4? With the addition of tracing, you can now get a peek at what is happening internally within your service. Traces from PollingDuplex will include information about what failed in communicating with your clients and...
  • Blog Post: Some known WCF issues in Silverlight 4

    When shipping a product, there are always a handful of painful issues that we unfortunately cannot fix due to schedule pressure. One thing we can do is blog about these issues early and provide workarounds, so customers don’t have to spend countless hours debugging. Here is the list of known issues...
  • Blog Post: MIX 2010 talk: what’s new in WCF in Silverlight 4

    I just realized I never got around to posting this. Here is a link to our presentation at MIX 2010 . Cheers, -Yavor Georgiev Program Manager, WCF
  • Blog Post: Two samples from today's MIX talk

    Thanks to the folks who attended my talk at MIX 2010 today. As promised, I'm posting the two samples I showed. I'll post an update when the video from my talk is available, so folks who couldn't attend can see it. Local Search I built a Silverlight application that runs on Windows Phone 7. It's...
  • Blog Post: PollingDuplex scaling in Windows Azure

    One of the great sessions at this year’s PDC talked about a collaboration between Invensys and Microsoft’s DPE team to build a solution that can deliver energy pricing information to a variety of clients, using a duplex message pattern. Effectively Invensys used a WCF service hosted in a Windows Azure...
  • Blog Post: Having a PollingDuplex service and any other WCF service in the same website causes Silverlight calls to be slow

    After polling duplex support for WCF was released in Silverlight 2 ( http://msdn.microsoft.com/en-us/library/dd470105(VS.95).aspx ), some customers reported the issue that when a polling duplex service co-exists with normal WCF service on the same IIS web application, the WCF service might be significantly...
  • Blog Post: Channel9 WCF duplex demo

    Recently I spent some time with Robert Hess over at Channel9 discussing Silverlight 3 and giving a short demo of our duplex binding. If you haven’t seen PollingDuplex in action, this might be of interest. Cheers, -Yavor Georgiev Program Manager, Connected Framework
  • Blog Post: Using WCF services from Silverlight in Azure

    With all the buzz around Windows Azure , you may have wondered how to host your Silverlight application in the cloud. Since Silverlight controls are essentially static content, hosting them is as easy as uploading some files to the cloud. When it comes to building WCF services to provide data to your...
  • Blog Post: Some known issues in SL3 Beta

    We've run across some issues with our web services features in the Silverlight 3 Beta and I want to share these here to hopefully save folks some time and frustration. Issue: On Windows 7 Beta, you might encounter the following error when generating a proxy: "The element 'httpTransport' cannot contain...
  • Blog Post: What's new with web services in Silverlight 3 Beta

    Silverlight 3 beta comes with a set of exciting web services features that address key customer requests. Binary message encoding In Silverlight 2 the only supported binding was BasicHttpBinding, which encodes outgoing messages as text and sends them over an HTTP transport. This binding is great...
  • Blog Post: New Web Services Features in Silverlight 2 RTW

    Here is an overview of the new features added since Beta 2. SOAP Headers SOAP headers were a big customer request, so we have added headers support in this release. There are two methods to use headers, depending on the customer scenario. The easier method is useful when you need to get/set...
  • Blog Post: Detailed Overview of Silverlight 2 Beta 2 Web Service Features

    As you have probably read already (in Scott or Tim's posts), Silverlight 2 Beta 2 provides a set of new and improved web service features. This post will go over our Beta 2 scenarions in more detail, and we intend to follow up over the next couple of weeks and drill down into particualr features. ...
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