How can I use ASP.net thirdparty webparts (in DLL form) inside a
Microsoft Sharepoint Webpart control?

I can create my own webcontrol and make it work, but as soon as I add
a thirdparty dll (even registed on the GAC of the server), then my
webpart stops functioning.

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Clarification of Question by novacaine-ga on 18 Nov 2005 03:26 PST

Just to clarify: ASP.net Webcontrol (system.web.ui.webcontrol) to be
used within a Sharepoint webpart. I can create everything and compile
1 dll and it works, but if I reference a third-party dll, it compiles,
but the webpart does not function once placed on the site.