private void KillProcess(string processName)
        {
            System.Diagnostics.Process myproc = new System.Diagnostics.Process();
            //得到所有打开的进程   
            try
            {
                foreach (Process thisproc in Process.GetProcessesByName(processName))
                {
                    //找到程序进程,kill之。
                    if (!thisproc.CloseMainWindow())
                    {
                        thisproc.Kill();
                    }
                }

            }
            catch (Exception Exc)
            {
                MessageBox.Show(Exc.Message);
            }
        }


        public static void StopProcess(string processName)
        {
            try
            {
                System.Diagnostics.Process[] ps = System.Diagnostics.Process.GetProcessesByName(processName);
                foreach (System.Diagnostics.Process p in ps)
                {
                    p.Kill();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

C#关闭进程的2种方法