I’ve just posted a blog entry on implementing event-driven workflows using the Pick activity, which is new in WF 4.0.  Happy exploring and HAPPY NEW YEAR!

The team I’m on recently started a team blog here: English version: http://blogs.msdn.com/flow/ Mandarin Chinese version: http://blogs.msdn.com/cnflow/ A lot of the content will be similar, so you have a choice as to the language in which you consume...

A user at TechEd 2009 Beijing asked us about a very interesting scenario.  After we got back to work, Andrew, Karin, and I brainstormed about the best way to implement it. The scenario consists of a process with three stages that the user would like...

I just got back yesterday from TechEd Beijing 2009 and it was a very exciting event.  Jian and I presented a breakout session on Windows Workflow Foundation 4.0 and even though it was held at 08:00 in the morning on the last day of the event, the...

Why is WF appropriate for coordinating long-running work? Let's take a look. Scenario: a simple expense approval service. You work for the IT department of a business and your boss asks you to build an expense approval service. It has the do the following...

(Standard disclaimer: I attempt to ensure accuracy, but if your cat dies as a result of this post, I take no responsibility.) Ever wondered how the WF scheduler works under the hood? Our workflows usually run exactly as expected (from a scheduling...

WF programs in 4.0 beta 2 can be loaded dynamically at runtime instead of needing to be statically linked in.  Here’s an example: static void Main( string [] args) { using (FileStream fs = new FileStream( @"..\..\Workflow1.xaml" , FileMode...

Hot off the presses, and no lines to wait through: WCF/WF 4.0 Beta2 samples contain the best info about how to use the goodness http://go.microsoft.com/fwlink/?LinkId=150780 .

I stumbled upon this post by Nate Talbert http://blogs.msdn.com/advancedworkflow/archive/2006/02/23/538160.aspx explaining why a workflow instance is single-threaded. Some of the exact implementation details are a little bit out-of-date now that WF 4...

Our PM intern has written an excellent demo showing how to leverage the .NET Access Control Service to perform control permissions to a resource. Here it is in his own words. A major use of .NET Access Control Service is to provide authorization for your...

The .NET Access Control Service samples shipped with the .NET Services SDK assume that the computer running them have the system clock synchronized to Internet time. This is a fine assumption for many production servers, but developers testing at home...

Our wonderful dev intern Chao Shi spent some time on a robot demo originally created by our lead PM Justin Smith . He got it working last week, just in time for a presentation to almost 100 college students who visited our offices last Friday. We showed...