public static HttpContext Current    {      get      {        return ContextBase.Current as HttpContext;      }      set      {        ContextBase.Current = (object) value;      }    }

 internal class ContextBase  {    internal static object Current    {      get      {        return CallContext.HostContext;      }      [SecurityPermission(SecurityAction.Demand, Unrestricted = true)] set      {        CallContext.HostContext = value;      }    }    [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]    public ContextBase()    {    }    internal static object SwitchContext(object newContext)    {      object hostContext = CallContext.HostContext;      if (hostContext != newContext)        CallContext.HostContext = newContext;      return hostContext;    }  }

 public static Object HostContext         {            [System.Security.SecurityCritical]  // auto-generated            get            {                 Object hC;                IllogicalCallContext ilcc = Thread.CurrentThread.GetIllogicalCallContext();                 hC = ilcc.HostContext;                 if (hC == null)                {                     LogicalCallContext lcc = GetLogicalCallContext();                    hC = lcc.HostContext;                }                return hC;             }            [System.Security.SecurityCritical]  // auto-generated_required             set             {                if (value is ILogicalThreadAffinative)                 {                    IllogicalCallContext ilcc = Thread.CurrentThread.GetIllogicalCallContext();                    ilcc.HostContext = null;                    LogicalCallContext lcc = GetLogicalCallContext();                     lcc.HostContext = value;                }                 else                 {                    LogicalCallContext lcc = GetLogicalCallContext();                     lcc.HostContext = null;                    IllogicalCallContext ilcc = Thread.CurrentThread.GetIllogicalCallContext();                    ilcc.HostContext = value;                }             }        } 

        internal IllogicalCallContext GetIllogicalCallContext()         {             return ExecutionContext.IllogicalCallContext;        }