Fredrik Normén

Together with Dag König and Danwei Tran at Microsoft, I’m building an app with the code name “Aspen”. This application will use most of the new features shipped with Visual Studio 2010, such as, Silverlight 4, Entity Framework 4, MEF, WCF RIA Services etc. We are going to use the MVVM pattern and a sort of Domain Driven Design (DDD) approach. Danwei is the GUI designer, she will use Sketchflow and Expression Blend 4. Dag König is the “Standards authority” and  will also do some development. My part is to be a developer, both backend and client-side. I will blog about our progress on my blog and that is the reason for the X in the title of this blog post. I don’t know how many parts it will be ;)

In my first part about validation and binding to custom forms I wrote about how we could with some small hack enable the Validation Tooltip for a bounded control manually when we press a button. In this post I will instead use Silverlight 4 with Commanding and the INotifyDataErrorInfo interface to “manually” show the validation tooltip for a specific control.

I have notice that some people have problems about how to implement User Input validation when they don’t use controls like the DataForm or DataGrid  etc, and instead bind directly to a TextBox or other user input controls. In this post I will write about different ways to handle validations. In this post I will work with a simple View. I will later add a post where I will use some new Validation features in Siverlight 4 and where I also use the MVVM pattern and Commanding.

Sometimes I think it’s hard to know what I should write about, my ideas comes from different sources. Some of my posts is based on questions people are asking on forums. If someone ask one specific question, it’s a big chance that someone else have the same kind of question, so I often blog about the solution so others kind find them. So this blog post will be about how we can from a HTML page navigate to a page hosting a Silverlight application and navigate to a specific .XAML page. Probably someone else have blogged about this before but I also use my blog as a reference for my self :P

Today is my new day at my new work. I have now started to work for Iptor a .Net and Java consultant company in Gothenburg. My role will be coaching, mentoring, consulting and also as a instructor. My main role is to help companies with starting up new projects, helping them with architecture and design choice and make sure they use the correct tools for the correct task. The main focus will be everything from small web based and RIA apps to enterprise apps where I will spend a lot of time with Silverlight and of course other .Net frameworks. I will also work as an instructor to lift developers and architects to a reasonable level to succeed with the implementation of projects. Please don’t hesitate to contact me if you need any help with upcoming or existing projects.

In my previous post about using Silverlight 4 Commanding, I got a question why I didn’t use delegates etc instead of creating a lot of ICommand classes. In this post I’m going to show how you can reduce the number of ICommand classes.

Note: This post is based on the WCF RIA Services VS 2008 PDC Beta and VS 2010 Beta 2 preview, changes can be done before the framework hits RTM.

Note: This blog post will use the WCF RIA Services PDC Beta and VS2010 Preview, changes to the framework can me made before it hits RTM.