XmlAttribute.AppendChild Method (XmlNode)
Adds the specified node to the end of the list of child nodes, of this node.
Assembly: System.Xml (in System.Xml.dll)
This node is of a type that does not allow child nodes of the type of the newChild node.
The newChild is an ancestor of this node.
The newChild was created from a different document than the one that created this node.
This node is read-only.
If the newChild is already in the tree, it is first removed.
If the node being inserted was created from another document, you can use XmlDocument.ImportNode to import the node to the current document. The imported node can then be inserted into the current document.
Available since 10
Available since 2.0