Workflow 4 and Visual Basic expressions Survey

The topic of Visual Basic expression in Windows Workflow Foundation 4 seems to be a bit of an item for some people as you can see in the comments to my blog posts about it here. Now personally I don’t think it is such a big deal as it only concerns the expressions entered in the workflow, the main project can still be C# if you so desire.   Anyway the team responsible at Microsoft have created a survey asking for feedback on the subject. So if you have an opinion, and many seem to, please take 5 minutes go … Continue reading Workflow 4 and Visual Basic expressions Survey

Workflow 4 and Visual Basic expressions

Note: This blog post is written using the .NET framework 4.0 Beta 2 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 right? Well not really when you think about it! After all power business users are expected to be able to modify workflows. And guess what their favorite tools are. That would be Microsoft Excel and … Continue reading Workflow 4 and Visual Basic expressions

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 aantal plaatsen voor deelnemers is wel beperkt tot maximaal 150. Wacht dus niet te lang met beslissen want voor je het weet is er geen plaats meer. Vergeet bij je aanmelding niet op te geven welke onderwerpen je interesse hebben. Bovendien nodigen we iedereen graag uit om zelf een sessie in te vullen. … Continue reading Nederlandse CodeCamp 2009

Error Logging Modules and Handlers for ASP.NET (MVC)

I am working on a new ASP.NET MVC app and like so many other applications out there I need to log any errors should they occur. recently I heard about ELMAH Error Logging Modules and Handlers for ASP.NET through this blog post of Scott Hanselman. So as using en existing and proven solution is always better that reinventing the wheel I decided to try ELMAH and see how easy it is to get started.   Well I can only say I am positively amazed at how easy it is.   Starting from scratch it took me less that 2 hours … Continue reading Error Logging Modules and Handlers for ASP.NET (MVC)

Passing data into a Windows Workflow Foundation 4 workflow

Passing parameters into a workflow is similar in WF4 as it was in WF3. In both case a Dictionary<string, object> is passed in when creating the workflow instance object. Alternatively when using the WF4 WorkflowInvoker you can pass it into the Invoke() method. This is quite simple but I have never been a fan of the very loose coupling here. basically on the outside you have to create a dictionary with as key something inside of the workflow. No compile time checking. No improvement where, unless you consider the somewhat easier unit testing with the WorkflowInvoker. The actual behavior between … Continue reading Passing data into a Windows Workflow Foundation 4 workflow

Paging with the Silverlight RIA services DomainDataSource

Using the declarative DomainDataSource that is part of the upcoming Silverlight 3 RIA services makes it quite easy to work with data. All you need to do is add a DomainDataSource control to the the XAML, point it to the generated DomainContext class (in this case NorthwindContext) and tell it which method to use to load the data from the web service(in this case LoadCustomers). Next add a DataGrid to display the data and you are good to go. <UserControl xmlns:dataControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.DataForm" x:Class="LOBUsingRIAServices.CustomerListPage" xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" xmlns:riaControls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Ria.Controls" xmlns:web="clr-namespace:LOBUsingRIAServices.Web" xmlns="" xmlns:x=""> <Grid x:Name="LayoutRoot" Background="White"> <riaControls:DomainDataSource x:Name="CustomerDataSource" LoadMethodName="LoadCustomers"> <riaControls:DomainDataSource.DomainContext> <web:NorthwindContext /> </riaControls:DomainDataSource.DomainContext> </riaControls:DomainDataSource> <data:DataGrid ItemsSource="{Binding … Continue reading Paging with the Silverlight RIA services DomainDataSource

Adding a custom machineKey section to the web.config

Normal 0 21 false false false MicrosoftInternetExplorer4 <!– /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:””; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:”Times New Roman”; mso-fareast-font-family:”Times New Roman”;} a:link, span.MsoHyperlink {color:blue; text-decoration:underline; text-underline:single;} a:visited, span.MsoHyperlinkFollowed {color:purple; text-decoration:underline; text-underline:single;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 70.85pt 70.85pt 70.85pt; mso-header-margin:35.4pt; mso-footer-margin:35.4pt; mso-paper-source:0;} div.Section1 {page:Section1;} –> /* Style Definitions */ table.MsoNormalTable {mso-style-name:”Table Normal”; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:””; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:”Times New Roman”; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Normally you should never have to set the <machineKey> in the in the web.config. This is only needed when am ASP.NET site runs on a … Continue reading Adding a custom machineKey section to the web.config

.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 expect this option will be added in the future. It turns out the .NET RIA Services use JSON as their serialization format. This is actually kind of nice as the DataContractJsonSerializer is part of the System.ServiceModel.Web assembly and therefore usable by all .NET clients. The good part is that a … Continue reading .NET RIA Services and data communication