c# xml to string XmlNodeType.EndElement is null

	XmlTextReader objreader = new XmlTextReader("c:\\a.xml");
	StringBuilder strBuilXML = new StringBuilder();
	while (objreader.Read())
	{
	if (objreader.IsStartElement())
	{
	if (objreader.IsEmptyElement)
	{
	Console.WriteLine("<{0}/>", objreader.Name);
	strBuilXML.Append("<" + objreader.Name);
	for (int attInd = 0; attInd < objreader.AttributeCount; attInd++)
	{
	objreader.MoveToAttribute(attInd);
	strBuilXML.Append(" " + objreader.Name + "=");
	strBuilXML.Append("\"" + objreader.Value + "\"");
	}
	strBuilXML.Append(">");
	strBuilXML.Append("</" + objreader.Name);
	strBuilXML.Append(">");
	}
	else
	{
	switch (objreader.NodeType)
	{
	case XmlNodeType.Element:
	strBuilXML.Append("<" + objreader.Name);
	for (int attInd = 0; attInd < objreader.AttributeCount; attInd++)
	{
	objreader.MoveToAttribute(attInd);
	strBuilXML.Append(" " + objreader.Name + "=");
	strBuilXML.Append("\"" + objreader.Value + "\"");
	}
	strBuilXML.Append(">");
	break;
	case XmlNodeType.Text:
	string value = objreader.Value;
	if (string.IsNullOrEmpty(value))
	{
	strBuilXML.Append("</" + objreader.Name);
	strBuilXML.Append(">");
	break;
	}
	else
	strBuilXML.Append(value);
	break;
	case XmlNodeType.EndElement:
	strBuilXML.Append("</" + objreader.Name);
	strBuilXML.Append(">");
	break;
	}
	}
	}
	}
	objreader.Close();
	Console.WriteLine(strBuilXML);

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