XML Remove problem

Hi guys,

i have this XML file

<?xml version="1.0" encoding="utf-8"?><urlset><url><loc>http://www.mydomain.com/</loc><lastmod>2016-01-06T03:45:13+00:00</lastmod><changefreq>daily</changefreq><priority>1.00</priority></url></urlset>



 // Delete Record
        public void DeleteSitemap(string url)
        {
//passing "http://www.mydomain.com"
            XDocument sitemapData = new XDocument();
            sitemapData.Root.Elements("url").Where(i => (string)i.Element("loc").Value == url).Remove();

            sitemapData.Save(HttpContext.Current.Server.MapPath("~/Sitemap.xml"));
        }


///this code would delete if the Root
///<urlset> is as such;

However, if my XML is as such

<?xml version="1.0" encoding="utf-8"?><urlset  xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url><loc>http://www.mydomain.com/</loc><lastmod>2016-01-06T03:45:13+00:00</lastmod><changefreq>daily</changefreq><priority>1.00</priority></url></urlset>

The code wouldn't work anymore...

can anyone help me out?  I've been searching for hours.

thank you

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