Winan,

You'll need to create a setup project to deploy applications that use Crystal and .NET. You didn't mention if you had done that, so I don't know if you haven't created one, or if there was a problem with one that was created.

Here are two links that give you some information.

http://support.businessobjects.com/communityCS/TechnicalPapers/crnet_deployment.pdf

If that doesn't help, you might try this one...

http://support.businessobjects.com/library/kbase/articles/c2011205.asp

Hope that helps...
Kevin