problem writing an xml file

[mickey]

Hi, I'm coding a like xml tree to write to a file. I'm using C# I'll hope you can help me.
The Code:

..........................................
myClass.Xml_doc.AppendChild(xml_root); 
 XmlTextWriter xmlW = new XmlTextWriter("..\\..\\output.html", null);
 xmlW.Formatting = Formatting.Indented;
myClass.Xml_doc.WriteContentTo(xmlW);                   
xmlW.Close();

..........................................
myClass.Xml_doc.AppendChild(xml_root); 
 XmlTextWriter xmlW = new XmlTextWriter("..\\..\\output.html", null);
 xmlW.Formatting = Formatting.Indented;
myClass.Xml_doc.WriteContentTo(xmlW);                   
xmlW.Close();

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The problem is output.html: intead of '<' and '>' there are '&lt;' and '&gt;'.
How Can I solve it, please?
Thanks
EDIT ---
the problem is that in a method, I have a string like: <script .......> </script> and ohter tags. Then, in my xml_doc, I attach that string as part of innerTEXT of a tag; I hope you'l understand where the point is.

[jacek]

It looks like you are adding the tags as text, not as XML snippet.