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MSDN Library
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StreamWriter.FlushAsync Method

Clears all buffers for this stream asynchronously and causes any buffered data to be written to the underlying device.

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

public override Task FlushAsync()

Return Value

Type: System.Threading.Tasks.Task
A task that represents the asynchronous flush operation.

ExceptionCondition
ObjectDisposedException

The stream has been disposed.

Windows Phone OS

Supported in: 8.1, 8.0

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