方法一：

using System.Diagnostics; 

Process[] vProcesses = Process.GetProcesses();

foreach (Process vProcess in vProcesses)

if (vProcess.ProcessName.Equals( "iexplore ",

StringComparison.OrdinalIgnoreCase))

{

MessageBox.Show( "IE已经打开 ");

break;

}

方法二：

using System.Diagnostics;

Process[] app = Process.GetProcessesByName("AMS");

            if (app.Length > )

            {

                MessageBox.Show("请关闭已经启动的程序后再进行尝试");

                return;

            }

            else

            {

                System.Diagnostics.Process.Start("AMS.exe");

            }

杀死进程：查找到对应的进程后就可以调用系统命令杀死指定名称的进程

            Process[] p = Process.GetProcessesByName("AMS");

            foreach (Process ps in p)

            {

                ps.Kill();

            }