Lendo um arquigo XML

<testnode>
    <element1>Element1 Text</element1>
    <element2>Element2 Text</element2>
    <element3>Element3 Text</element3>
    <element4>Element4 Text</element4>
    <element5>Element5 Text</element5>
</testnode>

string filename = "test.xml";

XmlTextReader tr = new XmlTextReader(filename);

while(tr.Read())
{
     if(tr.NodeType == XmlNodeType.Text)
          System.Console.WriteLine(tr.Value);
}

Element1 Text
Element2 Text
Element3 Text
Element4 Text
Element5 Text