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TextWriter.WriteAsync Method (Char)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Writes a character array to the text string or stream asynchronously.
public Task WriteAsync(
The character array to write to the text stream. If buffer is null, nothing is written.
Windows Phone OS
Supported in: 8.1, 8.0