When overridden in a derived class, moves the System.Xml.XPath.XPathNavigator to the first child node of the current node.
Returns true if the System.Xml.XPath.XPathNavigator is successful moving to the first child node of the current node; otherwise, false. If false, the position of the System.Xml.XPath.XPathNavigator is unchanged.
XPathNodeType.Root and XPathNodeType.Element are the only two System.Xml.XPath.XPathNodeType values that can have children. This property always returns false for all other System.Xml.XPath.XPathNodeType node types.