/// <summary>
        /// 关闭进程
        /// </summary>
        /// <param name="processName">进程名</param>
        private void KillProcess(string processName)
        {
            Process[] myproc = Process.GetProcesses();
            foreach (Process item in myproc)
            {
                if (item.ProcessName == processName)
                {
                    item.Kill();
                }
            }

        }


     //强制关闭最近打开的某个进程

     private void KillRecentProcess(string processName)

    {

         System.Diagnostics.Process[] Proc = System.Diagnostics.Process.GetProcessesByName(processName);

         System.DateTime startTime = new DateTime();
         int m, killId = 0;
         for (m = 0; m < Proc.Length; m++)
         {
             if (startTime < Proc[m].StartTime)
             {
                startTime = Proc[m].StartTime;
                killId = m;
             }
         }
         if (Proc[killId].HasExited == false)
         {
             Proc[killId].Kill();

         }

     }