July 28, 2014For apps that target Windows Phone OS 7.0 and 7.1, do not use any members of this type in your app. If you do, your code will throw a MethodAccessException. This type is security-critical, which restricts it to internal use by the .NET Framework for Windows Phone class library.
[SECURITY CRITICAL]This API is not CLS-compliant. Namespace: System.Threading
Receives the error code, number of bytes, and overlapped value type when an I/O operation completes on the thread pool.
Assembly: mscorlib (in mscorlib.dll)
[CLSCompliantAttribute(false)] [SecurityCriticalAttribute] public delegate void IOCompletionCallback( uint errorCode, uint numBytes, NativeOverlapped* pOVERLAP )