(пишется Web сервис) не получается получить доступ к данным сохранённым а Application в процедуре обработчика таймера

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public class Global : System.Web.HttpApplication
{
public Global()
{

}



struct SessStruct
{
public int idPeople;
public int idSession;
public DateTime LastActiv;
}


protected void Application_Start(Object sender, EventArgs e)
{
SessStruct [] SessionTable = new SessStruct [30];
int CountSess;
CountSess = 0;
Application.Lock();
Application["SessionTable"] = SessionTable;
Application["CountSess"] = CountSess;
Application.UnLock();
System.Timers.Timer aTimer = new System.Timers.Timer();
aTimer.Elapsed += new System.Timers.ElapsedEventHandler(OnTimedEvent);
aTimer.Interval = 60000;
aTimer.Enabled = true;
int i = 0;
while (i < 10)
{

}

}

private static void OnTimedEvent(object sender, System.Timers.ElapsedEventArgs e)
{

DateTime TimeNow = DateTime.Now;
SessStruct[] SessionTable = new SessStruct[30];
int CountSess;
CountSess = (int)Application["CountSess"] ;
SessionTable = Application["SessionTable"] as SessStruct ;

}
}

ошибка: error CS0120: An object reference is required for the nonstatic field, method, or property 'System.Web.HttpApplication.Application.get'