Could not load file or assembly 'System.Web.Silverlight' or one of its dependencies

This morning I was working on a prototype Silverlight application that I developed with Silverlight 2. I copied the project to my new shiny Dell XPS with GTX280 video card. Moment i hit F5 to debug the application, i get the following exception.

Could not load file or assembly 'System.Web.Silverlight' or one of its dependencies. The system cannot find the file specified
Line 2: <%@ Register Assembly="System.Web.Silverlight" Namespace="System.Web.UI.SilverlightControls" TagPrefix="asp" %>

It just took me by surprise. I was like, I did not change anything in the project in couple of months and I have new installation of all visual studio tools. After digging through release notes and documentation of Silverlight 3 SDK and tools, i found out that Microsoft has decided to get rid of ASP.Net Silverlight server control that was part of Silverlight 2 SDK. Since I have fresh install of Visual Studio 2008 and tool and I never installed Silverlight 2 SDK on this workstation, I did not have that server control.

Microsoft is recommending to use object tag to insert Silverlight components on the pages now. It is not big deal but it was nice having that server control do all the dirty work behind the scene for you and add object with appropriate parameters and other values. If you still want to continue using that Silverlight server control, you can copy System.Web.Silverlight assembly from other machine or you can install Silverlight 2 SDK.

There seem to be few issues with that ASP.Net server control but none are serious that you could not keep the control and use workaround to get over the issues.




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