Controller.cs

public class HomeController : Controller 
{ 
    public ActionResult Index() 
    { 
        return View(); 
    } 
 
    public ActionResult TemplateEditor() 
    { 
        var myString = RenderViewToString("Editor.aspx"); 
        return Content(myString); 
    } 
 
    protected string RenderViewToString(string viewPath) 
    { 
        System.IO.StringWriter htmlStringWriter = 
            new System.IO.StringWriter(); 
        Server.Execute(viewPath, htmlStringWriter); 
        return htmlStringWriter.GetStringBuilder().ToString(); 
    } 
}