The Problem Solver

Tell me and I will forget
Show me and I will remember
Involve me and I will understand
- Confucius -

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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...

Posted by Maurice | 1 comment(s)

WF4&WCF and message correlation
In the previous blog posts, here , here and here , I demonstrated how to  use WCF from WF4. This same some more about sending multiple messages to the same workflow, AKA Workflow Correlation.   One of the ugly parts of Windows Workflow Foundation...

Posted by Maurice | 2 comment(s)

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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...

Posted by Maurice | 5 comment(s)

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...

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Combined DevelopMentor instructors blog feed.
Michael Kennedy , one of the co instructors from DevelopMentor , has created a combined feed from all the blogs of the various DevelopMentor. An awesome group of people with a lot of knowledge to share. Highly recommended in you RSS reader. http://feeds...

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.NET RIA Services and data communication
I was working on an article about the .NET RIA Services and decided to fire up Fiddler to take a close look at the data actually passed around. I was sort of expecting to see a WCF REST based approach with XML messages. Turns out I was wrong, though I...

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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...

Posted by Maurice | 1 comment(s)

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...

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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

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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...

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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...

Posted by Maurice | 17 comment(s)

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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...

Posted by Maurice | with no comments

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...

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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...

Posted by Maurice | 5 comment(s)

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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...

Posted by Maurice | 6 comment(s)

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...

Posted by Maurice | 8 comment(s)

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...

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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...

Posted by Maurice | 31 comment(s)

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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...

Posted by Maurice | 15 comment(s)

Goodbye XOML, hello XAMLX
In the next version of workflow we are going to leave the XOML extension behind us. Creating workflow's or custom activities using markup will create a XAML file instead of the now familiar XOML file. That doesn't mean we are moving to exactly...

Posted by Maurice | 1 comment(s)

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