C#讀取系統和程序時間

           /// <summary>
            /// 程序第一次運行的時間
            /// </summary>
            int nFirstTimes;
            /// <summary>
            /// 系統運行毫秒數
            /// </summary>
            int nComputerTime = 0;
            /// <summary>
            /// 程序運行毫秒數
            /// </summary>
            int nApplicationTime = 0;
            /// <summary>
            /// 系統運行小時數
            /// </summary>
            int nChours = 0;
            /// <summary>
            /// 系統運行分鐘數
            /// </summary>
            int nCMineutes = 0;
            /// <summary>
            /// 系統運行秒數
            /// </summary>
            int nCseconds = 0;
            /// <summary>
            /// 程序運行小時數
            /// </summary>
            int nAhours = 0;
            /// <summary>
            /// 程序運行分鐘數
            /// </summary>
            int nAMineutes = 0;
            /// <summary>
            /// 程序運行秒數
            /// </summary>
            int nAseconds = 0;
            //獲取程序啓動時的系統運行時間。
            nFirstTimes = Environment.TickCount;//系統啓動後進過多少毫秒
            //程序運行過程讀取系統運行時間
            nComputerTime = Environment.TickCount;
            //連個時間相減的差是程序運行時間
            nApplicationTime = nComputerTime - nFirstTimes;
nChours = nComputerTime / 3600000 % 24;
            nCMineutes = nComputerTime / 60000 % 60;
            nCseconds = nComputerTime / 1000 % 60;

            nAhours = nApplicationTime / 3600000 % 24;
            nAhours = nApplicationTime / 60000 % 60;
            nAseconds = nApplicationTime / 1000 % 60;

            lblSysTime.Text = string.Format("{0}小時{1}分{2}秒",nChours,nCMineutes,nCseconds);
            lblAppTime.Text = string.Format("{0}小時{1}分{2}秒", nAhours, nAMineutes, nAseconds);