User Controls

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I recently checked a couple of blogs about using dynamically loaded User Controls. Some of the blogs mentioned SmartPart v2 (aka SonOfSmartPart) to load ASP.NET 2.0 User Controls. This WebPart is completely targeted to SharePoint 2003, but it will remain working in MOSS 2007. When creating new Web Parts, you have the option of creating Web Parts that inherit from System.Web.UI.WebControls.WebParts.WebPart (recommended) or Microsoft.SharePoint.WebPartPages.WebPart (inherits from). The Windows SharePoint Services WebPart class exists primarily for the purpose of backward compatibility (Web Parts continue to work in Windows SharePoint Services 3.0 without modification), and to provide a small set of features that are not available in the other class.


Besides the targeting it's also not possible to use this Web Part in a ASP.NET 2.0 Portal. I know it's really easy to drag and drop a User Control in ASP.NET 2.0 Portal, but I also want to have this ability in MOSS 2007. Furthermore I like to have an option to add User Controls dynamically (not included in my Portal project). Scott Guthrie has written some astonishing info in one of his blogs about whether it will be possible to host Web Parts built as ASP.NET 2.0 User Controls within SharePoint 2007. He checked with the SharePoint team, and they told him that this will be a supported scenario via an additional component you add to SharePoint and that they'll have a Whitewater and sample on how to-do this published later this year.


I couldn't imagine this option wasn't available in MOSS 2007 and that the SharePoint team will give a additional component only later this year. As Joris Poelmans wrote in his blog Usercontrols (ascx), webparts and SharePoint 2007, it isn't that hard to dynamically load a User Control. Reading this blog I decided to write my own SmartPart fully ASP.NET 2.0 compatible. I heard some rumors that Jan Tielens is writing a Revival of SmartPart too, but I couldn't wait that long.


I'm starting a series of posts about my own UserControl WebPart. The goal of the series is to create a DLL which is public to everyone who wants to use it. While other articles sometimes are too long, I want to keep them very short. That way you're able to read them before your workday begins or perhaps just before you shut down. 🙂


From every post I'll refer to this post and I'll keep an index here so you can easily find your way.

Complete index


  1. part I (Startup project)
  2. part II (Class Diagram and test UserControl project)
  3. part III (WebPart project)
  4. part IV (About EditorPart, displaying a info about the WebPart)
  5. part V (WebPart EditorPart, selecting a UserControl)
  6. part VI (UserControl EditorPart, discovering properties of UserControl)
  7. part VII (Consumer / Provider)

I try to keep you informed and eventually will post my UserControl WebPart as a DLL.