我不知道这是不是你的意思，但你可以制作一个"浏览器外"。应用Silverlight 3;例如，参见 http://silverlight.net/learn/learnvideo.aspx?video=187318 和 http://msdn.microsoft.com/en-us/magazine/dd882515.aspx

作为注释：此论坛旨在讨论WPF和Silverlight的Visual Studio设计器，而不是WPF和Silverlight平台本身。对于WPF平台问题，您通常可以更好地尝试 http://social.msdn.microsoft.com/Forums / en-US / wpf ，对于Silverlight平台问题，请尝试 http://silverlight.net/forums/

感谢
标记

Can anyone tell me whether it is possible to make a desktop application which can work online as well offline with the help of silverlight3 beta?
what other technology I can use for making such smartclient application?

I don't know if this is what you meant, but you can make an "out of browser" application with Silverlight 3; see for example http://silverlight.net/learn/learnvideo.aspx?video=187318 and http://msdn.microsoft.com/en-us/magazine/dd882515.aspx

As a note: this forum is intended for discussion of the Visual Studio designer for WPF and Silverlight, rather than the WPF and Silverlight platforms themselves.  For WPF platform questions you'll usually do better trying http://social.msdn.microsoft.com/Forums/en-US/wpf , for Silverlight platform questions try http://silverlight.net/forums/

Thanks
Mark