PM> Install-Package Localization

- <li>@Html.ActionLinkLocalization("English", "Index", "Locales", new { lang = "en_US" })</li>
- <li>@Html.ActionLinkLocalization("Türkçe", "Index", "Locales", new { lang = "tr_TR" })</li>
and more...
Or
- <a href="Locales/?lang=en_US">English</a>
- <a href="Locales/?lang=tr_TR">Türkçe</a>
and more...

@Html.Get("homepage") or @Html.Localize("homepage")

public void DefaultLocale( )
{
    HttpCookie cookie = Request.Cookies.Get("CacheLang");
    if ( cookie == null)
    {
        HttpCookie newCookie = new HttpCookie("CacheLang");
        newCookie.Value = "en_US";
        Response.Cookies.Add(newCookie);
    }
}

Xml file
<item id="homepage">Home Page</item>

Razor
     @Html.Localize("homepage")
     Or
     @Html.Get("homepage")
  
Code Behind
     Localization.Localize("homepage")
     Or
     Localization.Get("homepage")

@Html.ActionLinkLocalization()
@Html.ActionLocalization()

@Html.Get(new Inline(en: "book", tr: "kitap"))
@Html.Localize(new Inline(en: "book", tr: "kitap"))

public ActionResult Index(string lang = "en_US")
{
  Response.Cookies["CacheLang"].Value = lang;
  
  if (Request.UrlReferrer != null)
  Response.Redirect(Request.UrlReferrer.ToString());
  
  var message = Localization.Get("changedlng");
  
  return Content(message);
}

Attribute Localize
  Display Attribute 
    [DisplayLocalize("username")]
    public string Username { get; set; }
  
  String Length Attribute 
    [StringLengthLocalize(20, MinimumLength = 4)]
    public string DisplayName { get; set; }
  
  Required Attribute 
    [RequiredLocalized]
    public string DisplayName { get; set; }
  
  Description Attribute 
    [DescriptionLocalize]
    public string DisplayName { get; set; }

<system.web.webPages.razor>
  <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
      <pages pageBaseType="System.Web.Mvc.WebViewPage">
          <namespaces>
          <add namespace="System.Web.Mvc" />
          <add namespace="System.Web.Mvc.Ajax" />
          <add namespace="System.Web.Mvc.Html" />
          <add namespace="System.Web.Optimization"/>
          <add namespace="System.Web.Routing" />
          ## <add namespace="Insya.Localization" />
          ## <add namespace="Insya.Localization.Helpers" />
          </namespaces>
      </pages>
</system.web.webPages.razor>