System.Threading (mscorlib.dll)delegate

This delegate is used to communicate with thread pools that are created using the Win32 API. This is a delegate to a method that will be called by an unmanaged process.

public delegate void IOCompletionCallback(uint errorCode, uint numBytes,
     NativeOverlapped *pOVERLAP);

Passed To

Overlapped.{Pack( ), UnsafePack( )}

    Part II: Programming with the .NET Framework
    Part IV: API Quick Reference
    Chapter 26. System