using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Diagnostics;  //引用namespace ProcessApp{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            listBox1.Items.Clear();            listBox1.Items.Add("编号" + "  " + "名称");            //将所有的系统进程显示在列表框中            foreach (Process a in Process.GetProcesses())            {                string name = a.ProcessName;                int id = a.Id;               // listBox1.Items.Add(a.Id+"  "+a.ProcessName);                listBox1.Items.Add(id.ToString() + "  " + name);            }        }    }}