Answer / bala.r

.NET handles errors through exception classes. COM handles
errors through 32-bit data types called HRESULTs. All of
the .NET exception classes include HResult properties that
map to COM HRESULT codes.

If an exception occurs in a .NET object, the exception is
automatically mapped to the appropriate HRESULT and
returned to COM. Similarly, if an exception occurs in a COM
object, the COM HRESULT is mapped to the appropriate
exception class, which is returned to .NET, where it can be
handled just like any other exception.

If you are creating your own .NET exception classes for use
with COM, be sure to set the class’s HResult property so
that the exception can be handled within COM.

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