Hi, if I load an XML file, then modify a value, then try to save it I get an exception, access denied error. I've tried everything - help please????

For example:

XmlReaderSettin gs settings = new XmlReaderSettin gs();
settings.CloseI nput = true; // should close immediately now
XmlReader reader = XmlReader.Creat e(filename, settings);
XmlDocument doc = new XmlDocument();
doc.Load(reader );
...