Page.InitializeCulture Method

Page.InitializeCulture Method 

Sets the Culture and UICulture for the current thread of the page.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

Code
protected virtual void InitializeCulture()

How to: asp.net web localization by extending Page class.
部分代码：

Code
 1using System;
 2using System.Configuration;
 3using System.Web;
 4using System.Globalization;
 5using System.Threading;   
 6public class Page : System.Web.UI.Page
 7    {
 8        // Override InitializeCulture method to provide integrated localization support.
 9        protected override void InitializeCulture()
        {
            base.InitializeCulture();

            // For this example, we will use a local web.config application settings
            // section to define
            // page defaults and available settings.

            // To start we need a CultureInfo object constructed from a default language
            // selection.
            // You could also contruct a specialized section or a private configuration 
            // file.
            CultureInfo selectedCulture = new CultureInfo(ConfigurationManager.
                                          AppSettings["Localization_DefaultLanguage"]);

            // To save permanent information about user language selection, we will use
            // cookies.
            HttpCookie cookie = Request.Cookies.Get("lang");

            // Setting up a cookie to expire in a custom-defined time frame
            // (also defined in web.config).
            DateTime cookieExpiration = DateTime.Now.AddDays(
                                          Convert.ToInt32(
                                            ConfigurationManager.
                             AppSettings["Localization_LanguageCookieExpirationInDays"]));

            // Now, we will check for explicit query string language selection.
            //  This way we enable users to change language using url variables
            if (Request.QueryString["lang"] != null)
            {
                selectedCulture = new CultureInfo(Request.QueryString["lang"]);
                
                // We will also write a cookie to remember our selection.
                cookie = new HttpCookie("lang", selectedCulture.Name) { Expires = cookieExpiration };
                Response.Cookies.Add(cookie);
            }
            // If no explicit selection is found, use the one saved in a cookie.
            else if (cookie != null)
            {
                selectedCulture = new CultureInfo(cookie.Value);
            }
            // If for any reason both methods fail, fall to default settings.
            else
            {
                // Just write a cookie to save default option.
                cookie = new HttpCookie("lang", selectedCulture.Name) { Expires = cookieExpiration };
                Response.Cookies.Add(cookie);
            }

            // Apply selected language to Page culture.
            Thread.CurrentThread.CurrentUICulture = selectedCulture;
            Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(selectedCulture.Name);

        }
    }

Code
<appSettings>
        <add key="Localization_AvailableLanguages" value="en-gb,en-us,hr,it,fr,de,es,ru"/>
        <add key="Localization_DefaultLanguage" value="fr"/>
        <add key="Localization_LanguageCookieExpirationInDays" value="5"/>
</appSettings> 

The menu will be created using a simple inline foreach loop:

Code

  foreach (

              string language in ConfigurationManager.AppSettings["Localization_AvailableLanguages"].Split(','))

            {

                Response.Write(

                    string.Format(

                          "<li><a href='{0}?lang={1}'>{2}</a></li>",

                          Request.Path, language, new CultureInfo(language).NativeName));

            }