C# 窗口移动，文字显示

Question

c#代码：
this.Opacity = 1;
Point p = new Point(Screen.PrimaryScreen.WorkingArea.Width - 968, Screen.PrimaryScreen.WorkingArea.Height - 250);
this.PointToScreen(p);
this.Location = p;
this.Show();
for (int i = 0; i <= this.Height; i += 2)
{
this.Location = new Point(p.X, p.Y - i);
Thread.Sleep(10); // 将线程沉睡时间调的越小升起的越快
}

            this.timer2.Enabled = true;
            this.timer2.Start();

窗口一直在移动，可是在移动过程中文字为何不显示呢？？