C#之进程、线程

using System.Threading;

        Thread thread1;
        private void button1_Click(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;

            thread1 = new Thread(Thread1_Method);
            thread1.IsBackground = true;
            thread1.Start();

        }

        private void Thread1_Method()
        {
            int i = 0;
            while (true)
            {
                textBox1.Text = i.ToString();
                i++; 
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            thread1.Abort();
        }