How to Delete/Modify node from large xml file using C#

Please refer below code.

C#

protected void Page_Load(object sender, EventArgs e)
{
    List<string> values = new List<string>();
    DataSet ds = new DataSet();
    ds.ReadXml(Server.MapPath("~/XMLFile.xml"));
    foreach (DataRow row in ds.Tables[0].Rows)
    {
        string value = row.ItemArray[0].ToString();
        if (value.ToLower() != "http://www.facebook.com".ToLower())
        {
            values.Add(value);
        }
    }
    XmlDocument doc = new XmlDocument();
    XmlDeclaration xmlDeclaration = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
    XmlElement root = doc.DocumentElement;
    doc.InsertBefore(xmlDeclaration, root);

    XmlElement urlset = doc.CreateElement(string.Empty, "urlset", string.Empty);
    doc.AppendChild(urlset);

    foreach (var item in values)
    {
        XmlElement url = doc.CreateElement(string.Empty, "url", string.Empty);
        XmlElement loc = doc.CreateElement(string.Empty, "loc", string.Empty);
        XmlText locText = doc.CreateTextNode(item);
        loc.AppendChild(locText);
        url.AppendChild(loc);
        urlset.AppendChild(url);
    }
    doc.Save(@"C:\Users\shashikant.EXCELASOFT\Desktop\document.xml");
}

document.xml

<?xml version="1.0" encoding="UTF-8"?>
<urlset>
  <url>
    <loc>http://test.test.com/global/mc-lite-test-client/mc-lite/s/09db1cc9-a452-4a01-ba17-78692110</loc>
  </url>
  <url>
    <loc>http://www.1facebook.com</loc>
  </url>
</urlset>

I hope this will help you out.