Thread问题

这个是当打字正确的代码!!
if (str.Equals(this.label1.Text))
                    {
                        this.textBox1.Text = (++counttrue).ToString();
                        t1.Abort();
                        t1Begin();
                    }
                    else if (str.Equals(this.label4.Text))
                    {
                        this.textBox1.Text = (++counttrue).ToString();
                        t2.Abort();
                        t2Begin();
                    }
                    else if (str.Equals(this.label5.Text))
                    {
                        this.textBox1.Text = (++counttrue).ToString();
                        t3.Abort();
                        t3Begin();
                    }
                    else if (str.Equals(this.label6.Text))
                    {
                        this.textBox1.Text = (++counttrue).ToString();
                        t4.Abort();
                        t4Begin();
                    }
                    else if (str.Equals(this.label7.Text))
                    {
                        this.textBox1.Text = (++counttrue).ToString();
                        t5.Abort();
                        t5Begin();
                    }                    else
                    {
                        this.textBox2.Text = (++countfalse).ToString();
                        if (int.Parse(this.textBox2.Text) >= 10)
                        {
                            t1.Abort();
                            t2.Abort();
                            t3.Abort();
                            t4.Abort();
                            t5.Abort();
                            endtime = DateTime.Now;
                            MessageBox.Show("你已经挑战失败！", "消息");
                            Form3 f3 = new Form3(this);
                            this.Hide();
                            f3.Show();
                        }
                    }
public void luo()
        {
            int letter = 0;
            Random r = new Random();
            int j = 1 + r.Next(10);
            int y = r.Next(300);
            if (r.Next(10) > 5)
            {
                letter = 65 + r.Next(26);
            }
            else
            {
                letter = 97 + r.Next(26);
            }
            this.thisLabel.Text = ((char)letter).ToString();
            for (int i = 5; i < 350; i += j)
            {
                if (i >= 330)
                {
                    i = 0;
                    lock (this)
                    {
                        int num = f.countfalse++;
                        f.textBox2.Text = num.ToString();
                    }
                    if (int.Parse(f.textBox2.Text) >= 10)
                    {
                        if (f.n == 1)
                        {
                            f.t1.Abort();
                            f.t2.Abort();
                            f.t3.Abort();
                            f.endtime = DateTime.Now;
                            MessageBox.Show("你已经挑战失败！", "消息");
                            Form3 f3 = new Form3(f);
                            f.Hide();
                            f3.Show();
                        }
                        else if (f.n == 3)
                        {
                            f.t1.Abort();
                            f.t2.Abort();
                            f.t3.Abort();
                            f.t4.Abort();
                            f.t5.Abort();
                            f.endtime = DateTime.Now;
                            MessageBox.Show("你已经挑战失败！", "消息");
                            Form3 f3 = new Form3(f);
                            f.Hide();
                            f3.Show();
                        }
                        else
                        {
                            f.t1.Abort();
                            f.t2.Abort();
                            f.t3.Abort();
                            f.t4.Abort();
                            f.t5.Abort();
                            f.t6.Abort();
                            f.t7.Abort();
                            f.endtime = DateTime.Now;
                            MessageBox.Show("你已经挑战失败！", "消息");
                            Form3 f3 = new Form3(f);
                            f.Hide();
                            f3.Show();
                        }
                    }                }
                this.thisLabel.Location = new Point(y, i);
                Thread.Sleep(100);
            }