How to add xmlnamespace to a xmldocument

This works for me:

XmlDocument.DocumentElement.SetAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");XmlDocument.DocumentElement.SetAttribute("xmlns:xsd", "http://www.w3.org/2001/XMLSchema");

If you want to create the entire document you've posted, you might not want to forget the XML declaration:

        XmlDeclaration xml_declaration;        xml_declaration = XmlDocument.CreateXmlDeclaration("1.0", "ISO-8859-1", "yes");        XmlElement document_element = XmlDocument.DocumentElement;        XmlDocument.InsertBefore(xml_declaration, document_element);

In certain cases you might need it.

This question also shows another way of doing this:Creating a specific XML document using namespaces in C#

You could alternatively use the XmlNamespaceManager class

http://msdn.microsoft.com/en-us/library/d6730bwt%28VS.80%29.aspx

Finally there is always Linq too, you could use a XDocument and XNamespace

http://msdn.microsoft.com/en-us/library/bb387075.aspx

XmlDocument xmlDocSPack = new XmlDocument();XmlNode xmldocNode = xmlDocSPack.CreateXmlDeclaration("1.0", "", null);xmlDocSPack.AppendChild(xmldocNode);XmlElement LiftsMainNode = xmlDocSPack.CreateElement("Lifts");LiftsMainNode.SetAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");xmlDocSPack.AppendChild(LiftsMainNode);xmlDocSPack.Save("SPack"+DateTime.Now.Year + ".xml");

Output :

<?xml version="1.0"?><Lifts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />