Manipulating Namespace Support

The Namespaces property provides read and write access to a value indicating if the writer will perform namespace support. This property is set to true by default.

Listing 10.21. 
C#
XmlTextWriter writer = new XmlTextWriter("namespaces.xml");
writer.Namespaces = true;

writer.WriteElementString("po",
                          "test",
                          "http://www.fake.com");

VB
Dim writer As New XmlTextWriter("namespaces.xml")
writer.Namespaces = True
writer.WriteElementString("po",
                          "test",
                          "http://www.fake.com")

Output
<po:test xmlns:po="http://www.fake.com" />

If namespace support is turned off, then any attempts to declare a namespace will raise InvalidArgumentException. The Namespaces property must be set before any write operation has been executed. ...

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