C# How to post Blogger Article using API?

<https://lh3.googleusercontent.com/-kI3ReM9umQQ/VchiNJgBvnI/AAAAAAAAAHA/EvDsE4Wxtsg/s1600/z1.PNG>
I can't know this code's error

<sourcecode>
            CheckForIllegalCrossThreadCalls = false;
            Service service = new Service("blogger", "*<googleAPIprojectID>*
");
            service.Credentials = new GDataCredentials(username, password);
            GDataGAuthRequestFactory factory = 
(GDataGAuthRequestFactory)service.RequestFactory;
            factory.AccountType = "GOOGLE";
            /////////////////////////////////////////////////////////////

            ///////post////////////////////////////////
            AtomEntry post = new AtomEntry();
            post.Title.Text = title;
            post.Content = new AtomContent();
            post.Content.Content = postBody;
            post.Content.Type = "xhtml";
            int length = 0;
            //make sure that tags are not too long
            string[] tagsS = tags.Split(',');
            foreach (string label in tagsS)
            {
                length = length + label.Count();
                if (length > 198)
                {
                    string label2 = label.Substring(0, 199);
                    AtomCategory cat = new AtomCategory();
                    cat.Scheme = new Uri("http://www.blogger.com/atom/ns#");
                    cat.Term = label2;
                    post.Categories.Add(cat);
                    this.maskedTextBox5.Text = this.maskedTextBox5.Text + 
label2 + ",";
                    break;
                }
                else
                {
                    AtomCategory cat = new AtomCategory();
                    cat.Scheme = new Uri("http://www.blogger.com/atom/ns#");
                    cat.Term = label;
                    post.Categories.Add(cat);
                }
            }
            post.IsDraft = false;

            ///////////////publishing post/_/_/_/_/_/_\_|_/_)_(_--> () - {} 
- [] 0_o
            Uri blogFeedUri = new Uri("*http://www.blogger.com/feeds/" + 
blogId + "/posts/default*");
            AtomEntry createdEntry = null;
            try
            {
                createdEntry = service.Insert(blogFeedUri, post);
                MessageBox.Show("Done!");
            }
            catch (GDataRequestException exception)
            {
                if (exception.ResponseString == "Blog has exceeded rate 
limit or otherwise requires word verification for new posts")
                    MessageBox.Show("Blog has exceeded rate limit or 
otherwise requires word verification for new posts");
            }
            if (createdEntry == null)
                MessageBox.Show("Something went wrong, atricle was not 
published...\nCheck all html tags...");        
</sourcecode>

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