ASP.net MVC site : Redirect all “non WWW” request to WWW

Question

Recently I migrated an ASP.net site to ASP.net MVC site. Earlier there were two host headers one mydomain.com and another is www.mydomain.com. My SEO says you should use only on

Answer 1

You could use config or Url Rewriter in IIS, but the best method I've found is just to put some code in Application_BeginRequest() in your global.asax.cs like this:

var HOST = "www.mydomain.com";

if ( !Request.ServerVariables[ "HTTP_HOST" ].Equals(
  HOST,
  StringComparison.InvariantCultureIgnoreCase )
)
{
  Response.RedirectPermanent(
    ( HttpContext.Current.Request.IsSecureConnection ? "https://" : "http://" )
    + HOST
    + HttpContext.Current.Request.RawUrl );
}

Because you're doing this in code, you can have whatever logic you need on a per-request basis.