asp.net - How to redirect all .aspx URLs to their NEW location on a subdomain -

i completed transfer of large aspdotnetstorefront site (many pages/urls) domain's wwwroot subdomain.

for seo reasons want auto 301 redirect & old urls end in ".aspx" new location on subdomain. (all paths being same except being in subdomain instead of wwwroot)

example: old url= "http://www.mysite.com/c-2-some-product-page.aspx"

desired new url = "http://store.mysite.com/c-2-some-product-page.aspx"

i need check if requested page ends in .aspx, redirects "store" subdomain. should make sure requested old page url doesn't exist

this site running on windows host, appliedi.net

thanks much

i think want try in global.asax file

// untested, concept there. private void application_beginrequest(object source, eventargs e) {     if (httpcontext.current.request.url.tostring().tolower().startswith(         "http://www.mysite.com/"))     {         httpcontext.current.response.status =             "301 moved permanently";         httpcontext.current.response.addheader("location",             request.url.tostring().tolower().replace(                 "http://www.mysite.com/",                 "http://store.mysite.com/"));     } }