Regd: COM Componet in .net

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.NET3.5

.NET

COM

COM+

C#3.5

Hi,

I'm developing COM component with many classes.
whether i need to enable COM code for every class or single class is enough.

Eg.

Class Base
{
.....
.....
}

[ComImport, Guid("E436EBB3-524F-11CE-9F53-0020AF0BA770")]
Class Base2
{

Base obj = new Base();
.....
.....
}