Programmatically Adding Controls to a Sitefinity Page

CompiledControls.cs

var control = new NewsView();
var pageControl = pageManager.CreateControl<PageControl>(control, placeHolder);
pageNode.Page.Controls.Add(pageControl);
pageManager.SaveChanges();

SettingControlOrder.cs

// Add First Control
var ctrl = pageManager.CreateControl<PageControl>("~/Widgets/FirstControl.ascx", "Content");
pageNode.Page.Controls.Add(ctrl);

// Get first control id
var lastID = ctrl.Id;

// add second control, link to first control
ctrl = pageManager.CreateControl<PageControl>("~/Widgets/SecondControl.ascx", "Content");
ctrl.SiblingId = lastID;
newPage.Page.Controls.Add(ctrl);

// update control id to last added
lastID = ctrl.Id;

// add final control, link to previous control
ctrl = pageManager.CreateControl<PageControl>("~/Widgets/LastControl.ascx", "Content");
ctrl.SiblingId = lastID;
newPage.Page.Controls.Add(ctrl);

pageManager.SaveChanges();

UserControls.cs

var ctrl = pageManager.CreateControl<PageControl>("~/Widgets/MyControl.ascx", "Content");
pageNode.Page.Controls.Add(ctrl);
pageManager.SaveChanges();