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;
        }

窗體載入時暫不顯示窗體，延時後再顯示；