you have to rewrite/compile it in VB.NET, otherwise, see COM InterOp
Exposing COM Components to the .NET Framework
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconexposingcomcomponentstonetframework.asp?frame=true
Exposing COM Components to the .NET Framework
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconexposingcomcomponentstonetframework.asp?frame=true
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