Sometimes you have to create an XML declaration for a document. If you want to indicate that a document is standalone, you must use this property. If you want to encode your document with an encoding other than utf-8, you can specify an encoding through the XDeclaration. Another approach for encoding a document is to specify the encoding on an XmlWriter that you pass to LINQ to XML for writing.
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)