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int id;
private void button1_Click(object sender, EventArgs e)
{
Process csdn = Process.Start("IExplore.exe", "www.csdn.net");
id = csdn.Id;
}
private void button2_Click(object sender, EventArgs e)
{
MessageBox.Show((Process.GetProcessById(id)).ToString(), "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}