using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading;using System.Windows.Forms;namespace 多线程{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        Thread th;        private void button1_Click(object sender, EventArgs e)        {            //创建一个线程去执行Test方法            th = new Thread(Test);            //将线程设置为后台线程            th.IsBackground = true;            //标记这个线程准备就绪，可以随时被执行,            //但具体什么时候执行，由cpu决定            //括号里为Test方法的参数            th.Start(10000);            //线程休眠3秒后执行            Thread.Sleep(3000);        }        /// 
        /// 显示n以内的数        /// 
        ///         private void Test(object n)        {            int count = Convert.ToInt32(n);            for (int i = 0; i <= count; i++)            {                textBox1.Text = i.ToString();            }        }        private void Form1_Load(object sender, EventArgs e)        {            //取消跨线程的访问            Control.CheckForIllegalCrossThreadCalls = false;        }        private void Form1_FormClosing(object sender, FormClosingEventArgs e)        {            //当点击关闭窗体的时候，判断新线程是否为null            if (th != null)            {                //结束这个线程                th.Abort();            }        }    }}