HomeController.cs

public ActionResult GetView(string viewName)
{
    switch (viewName)
    {
        case "Open":
            var documents = new List<Document>();

            foreach (string file in Directory.GetFiles(
              Server.MapPath("/App_Data/documents")))
            {
                Document doc = new Document(file);
                documents.Add(doc);
            }

            return PartialView("Stageviews/Open", documents);
    }

    return PartialView("Stageviews/" + viewName);
}