EndWrite Method

BufferedStream.EndWrite Method (IAsyncResult)

.NET Framework 4.6 and 4.5

Ends an asynchronous write operation and blocks until the I/O operation is complete. (Consider using WriteAsync instead; see the Remarks section.)

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

public override void EndWrite(
	IAsyncResult asyncResult


Type: System.IAsyncResult

The pending asynchronous request.

Exception Condition

asyncResult is null.


This IAsyncResult object was not created by calling BeginWrite on this class.

In the .NET Framework 4 and earlier versions, you have to use methods such as BeginWrite and EndWrite to implement asynchronous file operations. These methods are still available in the .NET Framework 4.5 to support legacy code; however, the new async methods, such as ReadAsync, WriteAsync, and FlushAsync, help you implement asynchronous file operations more easily.

EndWrite must be called exactly once for every call to BeginRead. Failing to end a read process before beginning another read operation can cause deadlock or other undesirable behavior.

.NET Framework
Available since 4.5
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