在线人数统计

在 Global.asax 添加 代码
protected void Application_Start(Object sender, EventArgs e)
  {
   Application["user_sessions"] = 0;

  }
 
  protected void Session_Start(Object sender, EventArgs e)
  {

   Application.Lock();
   Application["user_sessions"] = (int)Application["user_sessions"] + 1;
   Application.UnLock();
  }
protected void Session_End(Object sender, EventArgs e)
  {

                        Application.Lock();
   Application["user_sessions"] = (int)Application           ["user_sessions"] - 1;
   Application.UnLock();

                     }
最后在页面访问Application["user_sessions"] 的值就可以了