How to create document type using API

Hello,

I have to create a document type using API, so i refer the Kentico built in API to create Document Page in CMS but using that i am only create a Page Menu Item. I have to create a page for different document type Please help me for that.

below is my code

Code
TreeProvider tree = new TreeProvider(MembershipContext.AuthenticatedUser);

            // Gets the current site's root "/" page, which will serve as the parent page
            TreeNode parentPage = tree.SelectNodes()
                .Path("/Videos/Archived")
                .OnCurrentSite()
                .Culture("en-us")
                .FirstObject;

            if (parentPage != null)
            {
                // Creates a new page of the "CMS.MenuItem" page type
                TreeNode newPage = TreeNode.New("Custom.Video",tree);

                // Sets the properties of the new page
                //newPage.DocumentName = "Articles";
                //newPage.DocumentCulture = "en-us";

                  newPage.SetValue("title", "Page Through API");

                // Inserts the new page as a child of the parent page
                newPage.Insert(parentPage);