public partial class Form1 : Form
{
  public Form1()
  {
   InitializeComponent();
  }
  private void Form1_Resize(object sender, EventArgs e)
  {
   Type(this, 25, 0.1);
  }
  private void Type(Control sender, int p_1, double p_2)
  {
   GraphicsPath oPath = new GraphicsPath();
   oPath.AddClosedCurve(new Point[] { new Point(0, sender.Height / p_1), new Point(sender.Width / p_1, 0), new Point(sender.Width - sender.Width / p_1, 0), new Point(sender.Width, sender.Height / p_1), new Point(sender.Width, sender.Height - sender.Height / p_1), new Point(sender.Width - sender.Width / p_1, sender.Height), new Point(sender.Width / p_1, sender.Height), new Point(0, sender.Height - sender.Height / p_1) }, (float)p_2);
   sender.Region = new Region(oPath);
  }
  private void Form1_Paint(object sender, PaintEventArgs e)
  {
   Type(this, 25, 0.1);
  }
}