301 Permanent Redirect

I have tried using both of these methods:
void Application_BeginRequest(object sender, EventArgs e)
  {
  string FromHomeURL = "http://website.com";

   string ToHomeURL = "http://www.website.com";

                if (HttpContext.Current.Request.Url.ToString().ToLower().Contains(FromHomeURL))
        {

           HttpContext.Current.Response.Status = "301 Moved Permanently";

            HttpContext.Current.Response.AddHeader("Location", Request.Url.ToString().ToLower().Replace(FromHomeURL, ToHomeURL));    
       }

    }
and this way:
pr ...