Hello,
you could place the code in the begging of Application_BeginRequest method in the Global.asax.cs file.
You could test the current URL or current alias path – some sample codes are here:
http://devnet.kentico.com/docs/devguide/cmscontext_class.htmIf it is the one it should be redirected add this code:
HttpContext.Current.Response.Status = "301 Moved Permanently";
HttpContext.Current.Response.AddHeader("Location", your_new_location);
I hope it could be helpful for you.
Best regards,
Helena Grulichova