Asynchronously writes text one buffer at a time.
buffer Character array containing the text to write.index The position in the buffer indicating the start of the text to write.count The number of characters to write.
The task that represents the asynchronous WriteChars operation.
This is the asynchronous version of XmlWriter.WriteChars(Char[], int, int), with the same functionality. To use this method, you must set the XmlWriterSettings.Async flag to true.