Response Permanent Redirect in MVC not issuing 301 or changing URL

Question

I am converting an old ASP.NET web forms site to ASP.NET MVC 5. I would like to issue permanent redirects for the old page URLs.

Here is what I have done -

Answer 1

Here is my solution (Global.asax)

protected void Application_PreRequestHandlerExecute(Object sender, EventArgs e)
        {
            string currentUrl = HttpContext.Current.Request.Path.ToLower();
            if (currentUrl.EndsWith("/about/about.aspx"))
            {
                Response.Status = "301 Moved Permanently";
                Response.AddHeader("Location", "/About");
                Response.End();
            }
        }

From answer here: Global 301 redirection from domain to www.domain