c#调用exe文件并打开,若已打开关闭重新打开

//using System.Diagnostics;
public void RunExe(string ExeFileName, string ParaString)
{    
    try
    {

        //如果有在运行了，先干掉，然后再运行
        if (ExeFileName.ToUpper().EndsWith("EXE"))
        {
            Process[] p = Process.GetProcessesByName(ExeFileName.Substring(0, ExeFileName.Length - 4));
            foreach (Process p1 in p)
            {
                p1.Kill();
            }
        }
        Process.Start(ExeFileName, ParaString);

    }
    catch (Exception ex)
    {
        MessageBox.Show("程序发生错误！");
    }
}