System.Xml.XPath.XPathNavigator.MoveToFirstChild C# (CSharp) Method

        public abstract bool MoveToFirstChild();

        private static void Traverse(TextWriter writer, XPathNavigator nav, int depth = 0)
        {
            var leadIn = new string(Constants.Tab, depth);

            if (nav.NodeType == XPathNodeType.Root)
                nav.MoveToFirstChild();

            do
            {
                switch (nav.NodeType)
                {
                    case XPathNodeType.Element:
                        WriteElement(writer, nav, depth, leadIn);
                        break;
                    case XPathNodeType.Text:
                        WriteTextData(writer, nav, leadIn);
                        break;
                    case XPathNodeType.Comment:
                        WriteComment(writer, nav, leadIn);
                        break;
                    default:
                        throw new InvalidDataException("Encountered unsupported node type of " + nav.NodeType);
                }
            } while (nav.MoveToNext());
        }