WriteProcessingInstructionAsync Method
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XmlWriter.WriteProcessingInstructionAsync Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Asynchronously writes out a processing instruction with a space between the name and text as follows: <?name text?>.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public virtual Task WriteProcessingInstructionAsync(
	string name,
	string text


Type: System.String
The name of the processing instruction.
Type: System.String
The text to include in the processing instruction.

Return Value

Type: System.Threading.Tasks.Task
The task that represents the asynchronous WriteProcessingInstruction operation.


An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message “An asynchronous operation is already in progress.”


An XmlWriter asynchronous method was called without setting the Async flag to true. In this case, InvalidOperationException is thrown with the message “Set XmlWriterSettings.Async to true if you want to use Async Methods.”

This is the asynchronous version of WriteProcessingInstruction(String, String), with the same functionality. To use this method, you must set the Async flag to true.

Windows Phone OS

Supported in: 8.1, 8.0

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