Error message in WF4: "The argument of type ‘<type>’ cannot be used. Make sure that it is declared on an activity."

The following error might occur when an activity executes: The argument of type ‘<type>’ cannot be used. Make sure that it is declared on an activity. If the type above refers to an implementation child, then it’s possible that it’s being created in the Execute method of the activity. If this is the case, try…


WF4 Activity Pack CTP1 Available (State Machine, Database)

I’m happy to announce that the WF4 Activity Pack CTP1 is now available for download.  This release consists of two different activities, database activities for interacting with a database and the much anticipated State Machine for authoring event driven workflows.  Here are a few key links: State Machine bits source documentation Database Activities bits source…


Windows Server AppFabric Architecture

A long time ago, applications running on Windows Server were simply EXEs, where developers wrote a lot of custom code on top of the Operating System (OS) to interact with clients and other applications over the network. COM+ and Microsoft Transaction Server (MTS) were added to make it easier to write and host server-side applications…

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New CTP Available for Download: WF Migration Kit

Happy Monday! It’s an exciting time here as we start ramping up for launch next month. Within the product group, there has been a flurry of activity as they squash their bugs, and the final polish is being placed on the Visual Studio release. In the business group, we’re busy finalizing web content and launch…

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Windows Server AppFabric Beta 2 is Available!

We are excited to announce that the Beta 2 release of Windows Server AppFabric is now available for download via http://msdn.microsoft.com/appfabric .  This is the Windows Server AppFabric build that works with the RC (Release Candidate) build of Visual Studio 2010/.NET 4. Windows Server AppFabric is a set of application services focused on improving the speed, scale,…

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Conditional GET and ETag Support in WCF WebHttp Services

This is part ten of a twelve part series that introduces the features of WCF WebHttp Services in .NET 4.  In this post we will cover: Generating and including ETags in responses from a WCF WebHttp Service  Adding Conditional GET support to a WCF WebHttp Service using ETags Over the course of this blog post…

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Providing WCF and WF Feedback to Microsoft

Perhaps known to a smaller portion of general community of WCF developers and WF developers, there is a Connection for WCF and Connection for WF that enable you, our customers, to submit bugs and feature suggestions. As the focusing for Visual Studio 2010 and .NET Framework 4 turns to polish and final tweaks, the team’s…

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Creating Views in WCF WebHttp Service with T4

This is part nine of a twelve part series that introduces the features of WCF WebHttp Services in .NET 4.  In this post we will cover: Learning the basics of T4 (Text Template Transformation Toolkit) Using T4 to create views in WCF WebHttp Services for text-based content Over the course of this blog post series,…

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RC docs are live!

The Visual Studio 2010 RC and .NET Framework 4.0 RC went live this week to MSDN subscribers. Our UE team has made available a bunch of improved topics and new topics along with the RC release. All the samples have a readme / documentation topic. More than ~200 WF/WCF sample readmes were added for this milestone….


Returning Custom Formats from WCF WebHttp Services

This is part eight of a twelve part series that introduces the features of WCF WebHttp Services in .NET 4.  In this post we will cover: Using the new WCF WebHttp Services API for content negotiation Returning content with custom formats in addition to XML and JSON Configuring WCF WebHttp Services with the WebHttpEndpoint Over…

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