Globalization Helper

 public class GlobalizationHelper
    {
        /// <summary>
        /// Selected Language Chane in All site Collection
        /// </summary>
        /// <param name="language"></param>
        public static void SelectedLangugae(string language)
        {
            HttpContext.Current.Session.Add("Lang", language);
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                using (SPSite site = new SPSite(SPContext.Current.Site.Url))
                {
                    site.AllowUnsafeUpdates = true;
                    foreach (SPWeb web in site.AllWebs)
                    {
                        web.AllowUnsafeUpdates = true;
                        System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo((language));
                        System.Threading.Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo((language));

                        // Add support for any installed language currently not supported.
                        SPLanguageCollection installed = SPRegionalSettings.GlobalInstalledLanguages;
                        System.Collections.Generic.IEnumerable<System.Globalization.CultureInfo> supported = web.SupportedUICultures;

                        foreach (SPLanguage lang in installed)
                        {
                            System.Globalization.CultureInfo culture = new System.Globalization.CultureInfo(lang.LCID);
                            web.AddSupportedUICulture(culture);

                        }
                        web.Update();
                        web.AllowUnsafeUpdates = false;
                    }
                    site.AllowUnsafeUpdates = false;
                }
            });
        }

        /// <summary>
        /// Change Culture with Language based
        /// </summary>
        /// <param name="culture"></param>
        public static void ChangeCulture(string culture)
        {

            switch (culture)
            {
                case "en-US": SelectedLangugae(culture);
                    break;
                case "en-GB": SelectedLangugae(culture);
                    break;
                case "zh-CN": SelectedLangugae(culture);
                    break;
                case "nl-NL": SelectedLangugae(culture);
                    break;
                case "fr-FR": SelectedLangugae(culture);
                    break;
                case "de-DE": SelectedLangugae(culture);
                    break;
                case "it-IT": SelectedLangugae(culture);
                    break;
                case "ja-JP": SelectedLangugae(culture);
                    break;
                case "ko-KR": SelectedLangugae(culture);
                    break;
                case "es-MX": SelectedLangugae(culture);
                    break;
                case "pt-PT": SelectedLangugae(culture);
                    break;
                case "ru-RU": SelectedLangugae(culture);
                    break;
                default: SelectedLangugae("en-US");
                    break;
            }
        }

        public static string  GetUserPreferredLanguage()
        {
            string Language = "en-US";
          
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    using (SPSite spsite = new SPSite(SPContext.Current.Web.Url))
                    {
                        SPUser oUser = SPContext.Current.Web.CurrentUser;
                        SPServiceContext spContext = SPServiceContext.Current;
                        UserProfileManager profileManager = new UserProfileManager(spContext);
                      
                        string username = CPUtility.GetUserProfileAccountName(oUser.LoginName);

                        if (profileManager.UserExists(username))
                        {
                            UserProfile profile = profileManager.GetUserProfile(username);
                            //Custom Fields
                            Language = Convert.ToString(profile["Language"].Value);
                        }
                          
                    }
                });
          
            return Language;
        }
    }
---------------------------------------------------------------------------------------------
 public class BasePage : LayoutsPageBase
    {
        protected override void InitializeCulture()
        {
            string currentCulture = "en-US";
            if (HttpContext.Current.Session["lang"] != null)
            {              
                currentCulture= Convert.ToString(Session["lang"]);
            }          
            Thread.CurrentThread.CurrentCulture =
                CultureInfo.CreateSpecificCulture(
                    currentCulture
                );

            Thread.CurrentThread.CurrentUICulture =
                new CultureInfo(currentCulture);
            base.InitializeCulture();
        }
    }
    public class BasePageUC : UserControl
    {
        protected override void FrameworkInitialize()
        {
            string currentCulture = "en-US";
            if (HttpContext.Current.Session["lang"] != null)
            {
                currentCulture = Convert.ToString(Session["lang"]);
            }
            Thread.CurrentThread.CurrentCulture =
                CultureInfo.CreateSpecificCulture(
                    currentCulture
                );

            Thread.CurrentThread.CurrentUICulture =
                new CultureInfo(currentCulture);
            base.FrameworkInitialize();
        }
    }
------------------------------------------------------------------------------------------------
 private CultureInfo cultureInfo;
 public string GetCultureDateFormat()
       {
           cultureInfo = new CultureInfo(HttpContext.Current.Session["userCulture"].ToString());

           return cultureInfo.DateTimeFormat.ShortDatePattern;
       }

       public string GetCultureDateTimeFormat()
       {
           cultureInfo = new CultureInfo(HttpContext.Current.Session["userCulture"].ToString());

           return cultureInfo.DateTimeFormat.ShortDatePattern + " " + cultureInfo.DateTimeFormat.LongTimePattern;
       }

       public string ConvertCultureDateFormat(string dateTime)
       {
           DateTime dt = Convert.ToDateTime(dateTime, DateTimeFormatInfo.InvariantInfo);

           cultureInfo = new CultureInfo(HttpContext.Current.Session["userCulture"].ToString());

           return dt.ToString(cultureInfo.DateTimeFormat.ShortDatePattern, cultureInfo);
       }

       public string RevertCultureDateFormat(string dateTime)
       {
           DateTime dt = Convert.ToDateTime(dateTime, DateTimeFormatInfo.InvariantInfo);

           cultureInfo = new CultureInfo("en-US");

           return dt.ToString(cultureInfo.DateTimeFormat.ShortDatePattern, cultureInfo);
       }

       public string ConvertCultureDateTimeFormat(string dateTime)
       {
           DateTime dt = Convert.ToDateTime(dateTime, DateTimeFormatInfo.InvariantInfo);

           cultureInfo = new CultureInfo(HttpContext.Current.Session["userCulture"].ToString());

           return dt.ToString(cultureInfo.DateTimeFormat.ShortDatePattern + " " + cultureInfo.DateTimeFormat.LongTimePattern, cultureInfo);
       }

       public string RevertCultureDateTimeFormat(string dateTime)
       {
           DateTime dt = Convert.ToDateTime(dateTime, DateTimeFormatInfo.InvariantInfo);

           cultureInfo = new CultureInfo("en-US");

           return dt.ToString(cultureInfo.DateTimeFormat.ShortDatePattern + " " + cultureInfo.DateTimeFormat.LongTimePattern, cultureInfo);
       }

       public string ConvertCultureNumericFormat(string strNumber)
       {
           double decValue = Double.Parse(strNumber, CultureInfo.InvariantCulture);

           cultureInfo = new CultureInfo(HttpContext.Current.Session["userCulture"].ToString());

           return decValue.ToString(cultureInfo);
       }

       public string RevertCultureNumericFormat(string strNumber)
       {
           double decValue = Double.Parse(strNumber, CultureInfo.InvariantCulture);

           cultureInfo = new CultureInfo("en-US");

           return decValue.ToString(cultureInfo);
       }