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Workflow 4 and Visual Basic expressions

When using Windows Workflow Foundation 4 you often need to enter expression in some activity property. The new thing is these expressions are all in the Visual Basic dialect regardless of what language you project is in. So when developing a project in C# the expressions are sill in Visual Basic. Weird...

Posted to The Problem Solver by Maurice on Mon, Oct 26 2009
Filed under: Filed under: .NET, NetFx3, Workflow, VB, WF4, VS2010
Nederlandse CodeCamp 2009

Op 21 november 2009 organiseren de SDN , Stichting dotNed en VBcentral samen het derde Nederlandse Code Camp . Dit is een dag lang met code, code sharing, freaking en gezellig samenzijn. Een evenement door ontwikkelaars, voor ontwikkelaars. De regie ligt voor een belangrijk deel bij de deelnemers! Het...

Posted to The Problem Solver by Maurice on Mon, Oct 19 2009
Filed under: Filed under: .NET, Visual FoxPro, LINQ, NetFx3, Workflow, VSTO, WCF, VB, webcast, ClickOnce, WPF, Silverlight, SDN, Data Access, ASP.NET
Sending your own objects to a WF4 workflow

In the previous two blog posts ( here and here ) I showed how to create and expose a Windows Workflow Foundation 4 workflow via WCF and have both a workflow and a regular C# client work with it. But the parameter and return value where real simple with just a string each. So how about passing some more...

Posted to The Problem Solver by Maurice on Thu, Aug 20 2009
Filed under: Filed under: .NET, NetFx3, Workflow, WCF, DevCenter, WF4, VS2010
Using Windows Workflow Foundation 4 Receive from an non WF client

In a previous blog post I described how to use the WorkflowServiceHost and host a workflow with a Receive activity that waits for WCF messages. I also added a WF4 client that called the service and received a response. However a lot of clients out there are not going to be workflows but “regular” code...

Posted to The Problem Solver by Maurice on Wed, Aug 19 2009
Filed under: Filed under: .NET, NetFx3, Workflow, WCF, WF4, VS2010
What does Windows Workflow Foundation 4 mean for existing workflow developers?

The question of what Windows Workflow Foundation version 4 means for developers currently developing using WF recently came up. As I mentioned before WF 4 is a complete rewrite and doesn’t use any of the existing WF 3 classes. The design of WF 4 is even quite different from the design of WF 3...

Posted to The Problem Solver by Maurice on Fri, Jul 3 2009
Filed under: Filed under: .NET, NetFx3, Workflow, DevCenter, WF4
Want to download all MIX sessions?

Then you should check Mike Swanson’s blog post here . He has two batch files, the first downloads all MIX session recordings with in the format you like, the second renames them so it is easier to make sense of all the media file names. If you just want a list of all sessions with download links this...

Posted to The Problem Solver by Maurice on Tue, Mar 31 2009
Filed under: Filed under: .NET, LINQ, NetFx3, WCF, VB, webcast, DevCenter, WPF, IronPython, Silverlight, ASP.NET
Software Development Event march 30th

Just one week to go to the next Software Development Event. The schedule with all the sessions is looking good. But this time there is even more! We will have a Microsoft Surface machine somewhere in the common area for people to try our. And if you have never played, oops tested, with a Surface machine...

Posted to The Problem Solver by Maurice on Mon, Mar 23 2009
Filed under: Filed under: .NET, LINQ, NetFx3, WCF, VB, WPF, Silverlight, SDN, ASP.NET
Using Windows Workflow Foundation with Windows Communication Foundation

Attached are the PowerPoint presentation and samples from my WF with WCF presentation in Timisoara, Romania. Thanks to Ineta for providing the funding for this. Download the PowerPoint and samples

Posted to The Problem Solver by Maurice on Sat, Mar 21 2009
Filed under: Filed under: .NET, NetFx3, Workflow, WCF
Unleash the power of State Machine Worklfows

Attached are the PowerPoint presentation and samples from my state machine workflow presentation in Timisoara, Romania. Thanks to Ineta for providing the funding for this. Download the PowerPoint and samples

Posted to The Problem Solver by Maurice on Sat, Mar 21 2009
Filed under: Filed under: .NET, NetFx3, Workflow
Samples and PowerPoint from my WCF talk

Attached is are the samples and slides I used for my intro into WCF talk yesterday at the VB Central meeting in the Netherlands. Download samples Enjoy! www.TheProblemSolver.nl Wiki.WindowsWorkflowFoundation.eu Now also on twitter at http://twitter.com/mauricedb

Posted to The Problem Solver by Maurice on Tue, Mar 10 2009
Filed under: Filed under: .NET, NetFx3, WCF, VB, DevCenter
Using a TransactionScopeActivity with a WCF ReceiveActivity revisited

Last year Marcel and I worked on a problem using a TransactionScopeActivity inside a WCF ReceiveActivity. I blogged a number of time about our finding, for example here . Last week I heard from Marcel that a hotfix was finally available that solves this problem. He blogged about it here . Great work...

Posted to The Problem Solver by Maurice on Tue, Mar 10 2009
Filed under: Filed under: .NET, NetFx3, Workflow, WCF, VB, DevCenter
Looking back at the MVP Summit

Last week lots of MVP, myself included, where in Redmond visiting Microsoft on our yearly MVP pilgrimage. The MVP Summit is always a great event. Not only do we get to talk to the MS team members who actually design and build all the software we love and use but we also get to meet each other. And with...

Posted to The Problem Solver by Maurice on Sat, Mar 7 2009
Filed under: Filed under: .NET, LINQ, NetFx3, Workflow, WCF, VB, DevCenter, WPF, Silverlight, WF4
Presenting at VB Central

Next week, on march 10th, I will be doing a presentation on getting started with WCF at the VB Central user group in the Netherlands. Its a free event so if you are in the neighborhood feel free to drop by. They do ask you register beforehand. Besides my session on WCF there will also be a session on...

Posted to The Problem Solver by Maurice on Tue, Mar 3 2009
Filed under: Filed under: .NET, NetFx3, WCF, VB, WPF
Handling HTTPS SSL certificate errors

When using self created SSL certificates with HTTPS WCF endpoints you might run into certificate validation errors. The best solution of to make sure all your certificates are fully trusted but sometimes that might not be an easy thing. The next best thing is to the the ServicePointManager.ServerCertificateValidationCallback...

Posted to The Problem Solver by Maurice on Sat, Feb 21 2009
Filed under: Filed under: .NET, NetFx3, WCF
Patterns & Practices release Prism version 2

The Patterns & Practices group at Microsoft have just released Prism version 2. I am pretty exited about this because Prism version 2 supports both WPF and Silverlight. And as it makes extensive use of the Model - View - ViewModel amongst other design patterns it is a great place to learn, even if...

Posted to The Problem Solver by Maurice on Wed, Feb 18 2009
Filed under: Filed under: .NET, NetFx3, DevCenter, WPF, Silverlight
Lazy loading using Ninject

In my previous blog post I demonstrated how you can use Ninject in your Silverlight application to automatically inject dependencies and make live easier. In the sample I injected the dependency, the PingService, inside my PageModel constructor. That worked just fine because the PingService is lightweight...

Posted to The Problem Solver by Maurice on Tue, Feb 10 2009
Filed under: Filed under: .NET, NetFx3, WCF, DevCenter, Silverlight
Using Ninject with Silverlight to make you code more testable

One useful feature when developing more complex code is using an inversion of control (IOC) container to do dependency injection. The basic principal of inversion of control, or dependency injection, is to pass in any dependencies when an object is created and not create them when needed. This way the...

Posted to The Problem Solver by Maurice on Mon, Feb 9 2009
Filed under: Filed under: .NET, NetFx3, WCF, DevCenter, Silverlight
Gotcha with HostingEnvironment.MapPath()

When developing WCF service the System.Web.Hosting.HostingEnvironment class is kind of useful as it will give you all sorts of information about the runtime environment of where you app is hosted. string path = HostingEnvironment.MapPath( @"\MyFile.txt" ); Now the problem is it only works when...

Posted to The Problem Solver by Maurice on Sun, Feb 8 2009
Filed under: Filed under: .NET, NetFx3, WCF
Returning exception information to a Silverlight client through WCF

Error handling code can be a drag but the simple fact is that everyone needs to write it because runtime errors can and do occur. Developing a Silverlight app is no different here, exceptions will occur and you as a developer will need to deal with them. One of the common things in Silverlight is communicate...

Posted to The Problem Solver by Maurice on Tue, Jan 27 2009
Filed under: Filed under: .NET, NetFx3, WCF, Silverlight
Consuming an ADO.NET Data Service from Silverlight

When developing Silverlight line of business (LOB) applications we often need to get at some data from a database. There are various ways to do so. One option that is easy to get started with with is creating an ADO.NET Entity Data Model (EDM) and exposing that entity model using an ADO.NET Data Service...

Posted to The Problem Solver by Maurice on Tue, Jan 6 2009
Filed under: Filed under: .NET, LINQ, NetFx3, WCF, DevCenter, Silverlight, Data Access

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