创建线程

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.Threading;namespace ThreadWinApp{    public partial class Form1 : Form    {        private Thread trd;        public Form1()        {            InitializeComponent();        }                private void button1_Click(object sender, EventArgs e)        {            MessageBox.Show("This is the main thread");        }        private void ThreadTask()        {            int stp;            int newval;            Random rnd = new Random();            while (true)            {                stp = this.progressBar1.Step * rnd.Next(-1,2);                newval = this.progressBar1.Value + stp;                if (newval > this.progressBar1.Maximum)                    newval = this.progressBar1.Maximum;                else if (newval < this.progressBar1.Minimum)                    newval = this.progressBar1.Minimum;                this.progressBar1.Value = newval;                Thread.Sleep(100);            }        }        private void Form1_Load(object sender, EventArgs e)        {             trd = new Thread(new ThreadStart(this.ThreadTask));            trd.IsBackground = true;            trd.Start();            Control.CheckForIllegalCrossThreadCalls = false;//排除错误   线程间操作无效: 从不是创建控件“progressBar1”的线程访问它。         }    }}