private void Form1_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < 10; i++)
            {
                RandomLabel mylabel = new RandomLabel();
                this.Controls.Add(mylabel);
                mylabel.Location = new Point(15, i * 25);
                mylabel.Size = new Size(50, 20);
                System.Threading.Thread.Sleep(300);
            }
        }