Thanks for reply. I can run the demo without any problem. But any otehr projects I created from VS 2008 with web site or web application options are not accessible from site. When I type in http://localhost/aliasname/xxxtestpage.aspx
or html it just gives nothing on the screen. Or sometimes it gives the error msg like "Initialize error: could not download Silverlight application. check web servers settings." But same project can be run in VS without any problem. Do I need set up IIS server specially? I already add ".xap" to MIME settings. Thanks.