ASP.NET httpApplication本地存储

我需要一些httpapplication本地存储。我认为applicationState是实现这一点的地方,但显然,它可以在AppDomain中的httpapplication实例之间共享。

   public class MyHttpModule : IHttpModule
    {
        private object initializingLock = new object();

        private static HttpApplication last;

        public void Init(HttpApplication context)
        {
            lock (initializingLock)
            {
                // always is false, as expected
               if (last == context) 
               { 
               }

               // is true for 2nd HttpApplication in AppDomain!
               if (last != null && last.Application == context.Application)                    
               {                   
               }

               last = context;
            }
        }
     }

用什么最好的Blace来存储其他人可以访问的每个http应用程序的数据?