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IOCompletionCallback Delegate

This type can be used only by trusted applications. If you try to use its members in a partial-trust application, your code will throw a MethodAccessException exception. This type is security-critical, which restricts its use.
[SECURITY CRITICAL]

Receives the error code, number of bytes, and overlapped value type when an I/O operation completes on the thread pool.

This API is not CLS-compliant. 

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)

[ComVisibleAttribute(true)]
[SecurityCriticalAttribute]
[CLSCompliantAttribute(false)]
public delegate void IOCompletionCallback(
	uint errorCode,
	uint numBytes,
	NativeOverlapped* pOVERLAP
)

Parameters

errorCode
Type: System.UInt32
The error code.
numBytes
Type: System.UInt32
The number of bytes that are transferred.
pOVERLAP
Type: System.Threading.NativeOverlapped*
A NativeOverlapped representing an unmanaged pointer to the native overlapped value type.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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