It's VB.NET but take a look at the article:
Building Outlook 2002 Add-ins with Visual Basic .NET
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnout2k2/html/o
dc_oladdinvbnet.asp

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Carlos J. Quintero
The MZ-Tools all-in-one add-in, now for .NET: http://www.mztools.com
>I am doing MS Outlook Plug-in by C#, but i cannot find the methods of
> Outlook, I wish to familiar with what they are!!! Could you tell me where
> I
> could find some useful information about it???
>
> Thanks all u guys!!! Merry Christmas!!!