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XmlWriter.WriteProcessingInstructionAsync Method (String, String)

.NET Framework 4.6 and 4.5

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.

Exception Condition

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, with the same functionality. To use this method, you must set the Async flag to true.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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