ASP.NET MVC switch language, how to implement?

is there any reason why you are using the session variable? a more common solution is to include the language code in the route, i.e. blah.com/en/info or blah.com/jp/info (for english and japanese)

if you did this every page on the site could contain links to each language. if you are writing a publicly accessible site this would also make it easier for google to index all your content.

this article explains how to include the language in the domain, ie. en.blah.com or jp.blah.com: http://blog.maartenballiauw.be/post/2009/05/20/ASPNET-MVC-Domain-Routing.aspx

UPDATED: Here's a simple example of including the language code in the URL route.

Change the default route to include a language parameter:

routes.MapRoute(
"Default", 
"{language}/{controller}/{action}/{id}", 
new { language = "en", controller = "Home", action = "Index", id = "" }
);

Add links for each language to your masterpage:

<li><%= Html.ActionLink(
    "Spanish", 
    ViewContext.RouteData.Values["action"].ToString(), 
    new { language = "es" })%></li>
<li><%= Html.ActionLink(
    "French", 
    ViewContext.RouteData.Values["action"].ToString(), 
    new { language = "fr" })%></li>
<li><%= Html.ActionLink(
    "English", 
    ViewContext.RouteData.Values["action"].ToString(), 
    new { language = "en" })%></li>    

These will render as links back to the page you are on - only with the language changed.

Following approach works good for me:

I'm using cookies and my own engine for localization All you need to put some link on the page that will redirect to something like this:

public class LanguageController : Controller
{
    //
    // GET: /Language/

    public void Change(string id)
    {
        var cuka = new HttpCookie("lang", id + "");
        cuka.Expires = DateTime.Now.AddYears(10);
        System.Web.HttpContext.Current.Response.Cookies.Add(cuka);

        if (Request.UrlReferrer.IsNotNull())
            Response.Redirect(Request.UrlReferrer.AbsoluteUri);
        else
            Response.Redirect("/");
    }

}

}

If you're interested in this engine, let me know.