How to Submit Site map xml to google webmaster tools

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Google

C#3.5

API

OAuth

I am using follwoign code to submit site map to webmaster tools


Google.GData.WebmasterTools.WebmasterToolsService service = new Google.GData.WebmasterTools.WebmasterToolsService("www.test1.com");
service.setUserCredentials("email", "password");
String lWebsite = "http%3A%2F%2Fwww%2Etest1%2Ecom%2F";
query.Uri = new Uri("https://www.google.com/webmasters/tools/feeds/sites/");

Google.GData.WebmasterTools.SitemapsEntry se = new Google.GData.WebmasterTools.SitemapsEntry();
se.Content.Src = "http://www.test1.com/Sitemap.xml";
se.Content.Type = "text/xml";
Google.GData.WebmasterTools.SitemapsEntry ret = service.Insert(new Uri("https://www.google.com/webmasters/tools/feeds/sites/" + lWebsite + "/sitemaps/"), se);

But no luck with this code. can any one provide me some sample code to submit site map?