Don't use XmlDocument use XmlTextReader instead

Hi,
I had an assignment to read a 200 MB xml file
i dont think that XmlDocument can help me here...
so i found the XmlTextReader object that made a great job
and from this moment i always use XmlTextReader to read
xml file content, so here is my example:

lets say that i want to read this Test.xml file:

<?xml version="1.0" encoding="utf-8" ?>

<RootNode>

 <Child>

  <Item Att="1">A</Item>

  <Item Att="2">B</Item>

 </Child>

 <Child>

  <Item Att="3">C</Item>

  <Item Att="4">D</Item>

 </Child>

</RootNode>

and this function read all the attributes and content
of the Item node in the xml:

public void ReadXml()
{
    int iCodepage = 862;
    string sAttribute, sNodeValue;
    string sFilePath = @"Test.xml";
    StreamReader oFileStream = null;
    XmlTextReader reader = null;
    //@@@ Check if the file exists
    if (!File.Exists(sFilePath))
        return;

    //@@@ Get the file as XmlTextReader
    oFileStream =
    new StreamReader(sFilePath, Encoding.GetEncoding(iCodepage));
    reader = new XmlTextReader(oFileStream);

    //@@@ Loop through all the file
    while (reader.Read())
    {
        //@@@ If we in Item node
        if (reader.Name.Equals("Item") &&
         (reader.NodeType == XmlNodeType.Element))
        {
             //@@@ Get the Attribute (Att) value
             reader.MoveToAttribute("Att");
             sAttribute = reader.Value;
             Console.WriteLine(sAttribute);
             //@@@ Get the node value
             reader.MoveToElement();
             sNodeValue = reader.ReadInnerXml();
             Console.WriteLine(sNodeValue);
        }
   }
  }