Snippet 2:

private void Btn_New_Click(object sender, System.EventArgs e)
{
      PrettyButton btn = new PrettyButton();
      
      Random r = new Random();
      
      /* pick random color */
      int red = r.Next(256);
      int green = r.Next(256);
      int blue = r.Next(256);
      btn.BackColor = Color.FromArgb(red, green, blue);
      
      /* get form size */
      int formWidth = this.ClientSize.Width;
      int formHeight = this.ClientSize.Height;
 
      /* set location */
      int x = r.Next(formWidth);
      int y = r.Next(formHeight);
      btn.Location = new Point(x, y);
      
      this.Controls.Add(btn);
}