Response.Redirect HTTP status code

I've used this handy Permanent Redirect with success:

public void RedirectPermanent(string newPath)
{
  HttpContext.Current.Response.Clear();
  HttpContext.Current.Response.Status = "301 Moved Permanently";
  HttpContext.Current.Response.AddHeader("Location", newPath);
  HttpContext.Current.Response.End();
}

The error you are getting is not due to response.redirect !

The HTTP response status code 301 Moved Permanently is used for permanent redirection, meaning current links or records using the URL that the 301 Moved Permanently response is received for should be updated to the new URL provided in the Location field of the response.