This was answered in the post "Change culture based on a link MVC4". You need to inherit your Controller from a BaseController, override the BaseController's Initialize method, and use a cookie. This is not my code, but in case that link breaks:
protected override void Initialize(System.Web.Routing.RequestContext requestContext)
{
HttpCookie languageCookie = System.Web.HttpContext.Current.Request.Cookies["Language"];
if (languageCookie != null)
{
Thread.CurrentThread.CurrentCulture = new CultureInfo(languageCookie.Value);
Thread.CurrentThread.CurrentUICulture = new CultureInfo(languageCookie.Value);
}
else
{
//other code here
}
base.Initialize(requestContext);
}
and
<li>@Html.ActionLink("Eng", "ChangeCulture", "Home", new { lang="en-US"}, new { @class = "languageSelectorEnglish" })</li>
with
public void ChangeCulture(string lang)
{
Response.Cookies.Remove("Language");
HttpCookie languageCookie = System.Web.HttpContext.Current.Request.Cookies["Language"];
if (languageCookie == null) languageCookie = new HttpCookie("Language");
languageCookie.Value = lang;
languageCookie.Expires = DateTime.Now.AddDays(10);
Response.SetCookie(languageCookie);
Response.Redirect(Request.UrlReferrer.ToString());
}