C#中弹出式窗体如何避免闪烁？

private void reportQueryfrm_Load(object sender, EventArgs e)
{
//SetStyle(ControlStyles.ResizeRedraw, true);
//SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
//SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.Opacity = 0;
timer1.Interval = 50;
timer1.Enabled = true;
}

private void timer1_Tick(object sender, EventArgs e)
{
timer1.Enabled = false;
this.Opacity = 1;
}