public void Init(HttpApplication context)
{
   context.BeginRequest += new EventHandler(context_BeginRequest);
}
void context_BeginRequest(object sender, EventArgs e)
{
   HttpApplication application = (HttpApplication)sender;
   HttpContext context = application.Context;
   //记录IP
}

------解决方案--------------------
up

------解决方案--------------------
按要求，session_start就行了吧？