How to add a new Blogger post with labels from C#

First download and install Google API from here:
http://code.google.com/p/google-gdata/downloads/list

Add a reference to "Google Data API Core Library",
and use the following function:

public static bool AddPost(string title, string bodyHTML, string[] labels)

{

    Service service = new Service("blogger", "<program name>");

    service.Credentials = new GDataCredentials("<username>", "<password>");

    AtomEntry newPost = new AtomEntry();

    newPost.Title.Text = title;

    newPost.Content = new AtomContent();

    newPost.Content.Content = bodyHTML;

    newPost.Content.Type = "html";

    foreach (string label in labels)

    {

        AtomCategory cat = new AtomCategory();

        cat.Scheme = new Uri("http://www.blogger.com/atom/ns#");

        cat.Term = label;

        newPost.Categories.Add(cat);

    }

    AtomEntry response = null;

    try

    {

        response = service.Insert(new Uri("<uri>"), newPost);

    }

    catch (GDataRequestException exception)

    {

        if (exception.ResponseString == "Blog has exceeded rate limit or otherwise requires word verification for new posts")

        {

            return false;

        }

        else

        {

            throw exception;

        }

    }

    if (response == null)

    {

        throw new Exception("Something went wrong");

    }

    return true;

}

Note what you need to replace:

• <program name>
• <username>
• <password>
• <uri> is for example: http://ycouriel.blogspot.com/feeds/posts/default

Also note the marked yellow line. It took me some nasty googling time to find it. You must put it for the labels to work.