Can silverlight 3 or silverlight 4 detect which version of .NET framework installed on client machine without being in OOB mode?
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43answers:
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            sure, just look at the user-agent header.
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727; .NET CLR 3.0.04425.00).
                  Sky Sanders
                   2010-02-13 16:08:54