How to Post New feeds to google blogger using google service...

I tried this below code but is retuns error with URL which i provided. I 
worked from many days but its not working and i posted this issue in many 
forams but they reffer only blogger help links.. Could you help me to what 
is the process to Post new feeds to Google Blogger...


string blogId = "xxxxxxxxxxxx";
            Service service = new Service();
            service.setUserCredentials(username, password);
            AtomEntry newPost = new AtomEntry();
            newPost.Title.Text = "Marriage!";
            newPost.Content = new AtomContent();
            newPost.Content.Content = "<div 
xmlns='http://www.w3.org/1999/xhtml'>" +
                "<p>Mr. Darcy has <em>proposed marriage</em> to me!</p>" +
                "<p>He is the last man on earth I would ever desire to 
marry.</p>" +
                "<p>Whatever shall I do?</p>" +
                "</div>";
            newPost.Content.Type = "xhtml";
            newPost.IsDraft = true;


            Uri blogFeedUri = new Uri("https://www.blogger.com/feeds/" + 
blogId + "/posts/default/");
            AtomEntry createdEntry = service.Insert(blogFeedUri, newPost);

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