title: ASP.NET MVC - cross sub domain authentication/membership
body: <p>Hit a roadblock while implementing a <a href="https://stackoverflow.com/questions/1170008/building-a-language-switcher-2-languages-only-asp-net-mvc">sub domain based language switcher</a> (en.domain.com loads English, jp.domain.com loads Japanese).</p>
  
  <p><strong>How do I get a single membership system to work across multiple sub domains (ASP.NET MVC C#)?</strong></p>
  
  <p>Saw something about adding <code>domain="domain.com"</code> to <code>&lt;forms &gt;</code> entry in web.config. Did that, but does that work when testing on local visual studio development web server?</p>