Can anybody tell me how to delete a specific node from an XML file?

See more:

C#7.0

    bool retval = false;
    XmlDocument doc = new XmlDocument();
    try
    {
        doc.Load(frmMain.FetchFileName(sFromFile));
        XmlNodeList nodes = doc.GetElementsByTagName("Type");
        foreach (XmlNode node in nodes)
        {
            if (node.FirstChild.InnerText == "Birthday")
            {
                //  Have found the right node. ? How do I delete it?
                //  node.RemoveChild(node.FirstChild);   Not like this
                //  doc.RemoveChild(node);               Nor like this
                //  node.RemoveChild(node);              Nor like this
                //  node.RemoveAll();                   // This gives no error
                node.ParentNode.RemoveChild(node);      // This gives no error

                doc.Save(sFromFile);
                retval = true;
                break;
            }

        }
    }
    catch
    {
        MessageBox.Show("Exception!!!", "Oops!");
        return false;
    }

    return retval;
}

What I have tried:

I have tried the code above, as you might see the first three attempts I made, failed.
Two attempts executed the code without complaining (commented This gives no error), but
did not actually delete anything from the file. Here is a snippet of the xml file.

The code looks for and finds the birthday node, which is what I am trying to delete
so that the file should look like this afterwards:

<?xml version="1.0"?>
  <importanttype>
    <type>
      <name>Appointment
        <predefined>Yes
   .
   .       a bunch of other nodes in here
   .
    <type>
      <name>Holiday
      <predefined>Yes

I am baffled. Can anybody help me please?
Thanking you in anticipation, Noel.