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Blittable types what constitutes a blittable type allows a developer to identify situations where intervention is and is not required for a type to be correctly marshaled. In this way, less time is wasted on over-specification of types or function calls. Blittable types Blittable types are data types in the Microsoft .NET framework that have an identical presentation in memory for both managed and unmanaged code. Understanding the difference between blittable and non-blittable types can aid in using COM Interop or P/Invoke, two techniques for interoperability in .NET applications. A memory copy operation is sometimes referred to as "block transfer", shortened to