public class BF_CheckUpdate
     {
         private static object LockObject = new Object();

         // 定義數據檢查Timer
         private static Timer CheckUpdatetimer = new Timer();

         // 檢查更新鎖
         private static int CheckUpDateLock = 0;

         ///
         /// 設定數據檢查Timer參數
         ///
         internal static void GetTimerStart()
         {
             // 循環間隔時間(10分鐘)
             CheckUpdatetimer.Interval = 600000;
             // 允許Timer執行
             CheckUpdatetimer.Enabled = true;
             // 定義回調
             CheckUpdatetimer.Elapsed += new ElapsedEventHandler(CheckUpdatetimer_Elapsed);
             // 定義多次循環
             CheckUpdatetimer.AutoReset = true;
         }

         ///
         /// timer事件
         ///
         ///
         ///
         private static void CheckUpdatetimer_Elapsed(object sender, ElapsedEventArgs e)
         {
            // 加鎖檢查更新鎖
             lock (LockObject)
             {
                 if (CheckUpDateLock == 0) CheckUpDateLock = 1;
                 else return;
             }        

            //More code goes here.
           //具體實現功能的方法
            Check();
               // 解鎖更新檢查鎖
             lock (LockObject)
             {
                 CheckUpDateLock = 0;
             }           
         }
       }