true if a matching sibling element is found; otherwise, false. If a matching sibling element is not found, the XmlReader is positioned on the end tag (XmlReader.NodeType is XmlNodeType.EndElement) of the parent element.
Do not call XmlReader.ReadToNextSibling(string, string) when the XmlReader is an initial state (XmlReader.ReadState is ReadState.Initial). You can call XmlReader.Read to advance the XmlReader and then call the XmlReader.ReadToNextSibling(string, string) method.