How To Add MVC Widget To A Page Using Sitefinity API

Global.asax.cs

public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            Bootstrapper.Bootstrapped += Bootstrapper_Bootstrapped;
        }

        private void Bootstrapper_Bootstrapped(object sender, EventArgs e)
        {
            this.AddMvcWidgetToPage();
        }
        
        private void AddMvcWidgetToPage()
        {
            var manager = PageManager.GetManager();
            manager.Provider.SuppressSecurityChecks = true;

            // 1) Find the page and start editing it
            var pageNode = this.GetPageNodeByName("MyPage");
            var pageToEdit = manager.EditPage(pageNode.GetPageData().Id, CultureInfo.CurrentUICulture);

            // 2) Create widget
            var widget = CreateMVCScriptWidget();

            // 3) Add widget to a placeholder on page
            var placeholderId = this.GetFirstPlaceholderOnPage(pageNode);
            var widgetControl = manager.CreateControl<PageDraftControl>(widget, placeholderId);
            widgetControl.Caption = "My Script";
            pageToEdit.Controls.Add(widgetControl);

            // 4) Publish and save changes
            manager.PublishPageDraft(pageToEdit, CultureInfo.CurrentUICulture);
            manager.SaveChanges();
        }

        private PageNode GetPageNodeByName(string name)
        {
            var manager = PageManager.GetManager();

            return manager.GetPageNodes()
                .ToList()
                .Where(p => p.Title == name)
                .FirstOrDefault();
        }

        private static MvcControllerProxy CreateMVCScriptWidget()
        {
            var controller = new JavaScriptController();
            controller.Model.Mode = ResourceMode.Inline;
            controller.Model.Position = EmbedPosition.BeforeBodyEndTag;
            controller.Model.InlineCode = "alert('Hello, Sitefinity.');";

            var mvcWidget = new MvcControllerProxy();
            mvcWidget.ControllerName = controller.GetType().FullName;
            mvcWidget.Settings = new ControllerSettings(controller);

            return mvcWidget;
        }

        private string GetFirstPlaceholderOnPage(PageNode pageNode)
        {
            return pageNode
                .GetPageData()
                .Controls.First()
                .PlaceHolders.First();
        }
    }