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博客园 - helloworld22

An excellent mockup tool -- Balsamiq Impression of Team Foundation Server 2010 Impression Of Book – Beautiful Architecture (翻译)十分钟内安装,配置,使用Windows Server AppFabric jQuery插件floatIt,浮动div并居中在上方或者下方 - helloworld22 - 博客园 some useful links for dealing with blg file and performance analyses The time zones of Event log 用证书实现windows 2003下IIS的SSL安全通信 5 Whys Quickly Getting to the Root of a Problem Outlook 2007 Conflicts With Google Desktop Encourage Sentences Collections kill all user in a database, very useful Be careful when you compare the GUID with a string Jmail 64bit 64位 不支持 machineKey - helloworld22 - 博客园 Error Install MS SQL Server Express in Windows XP SP3 / MSXML6 SP2 Sql 2005 Database diagram support objects cannot be installed because this database does not have a valid owner An error occurred during the execution of xp_cmdshell. A call to 'LogonUserW' failed with error code: '1385' Page Load called twice With FireFox - helloworld22
标准Singleton设计模式,多线程下
helloworld22 · 2009-12-24 · via 博客园 - helloworld22

 public class SessionAssistant  {
  private static volatile SessionAssistant instance;
  private static object syncRoot = new Object();


  private SessionAssistant()
  {
  }

  public static SessionAssistant Instance
  {
   get
   {
    if ( instance == null )
    {
     lock ( syncRoot )
     {
      if ( instance == null )
      {
       instance = new SessionAssistant();
      }
     }
    }

    return instance;
   }
  }
 }