If you’re building Silverlight applications and need to be able to run Silverlight 2 and Silverlight 3 on the same machine (even though Visual Studio 2008 doesn’t support Silverlight multi-targeting) then check out Amy Dullard’s post . I won’t go through
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Read the complete post at http://weblogs.asp.net/dwahlin/archive/2009/03/29/running-silverlight-2-and-silverlight-3-on-the-same-machine.aspx