COM Interoperability and ADO.NET
The Component Object Model (COM) has been around for many years and is used by many Windows applications. Eventually the .NET platform will replace COM, but until then you may need to develop COM components from .NET and access them from unmanaged code, or you may want to use COM components in .NET applications. COM interoperability (also referred to as COM Interop) enables you to use existing COM components in .NET applications or use.NET components in unmanaged code.
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