how to make a hollow in a form

Hi Jegan Priya,

             You can use "TransparencyKey" property to make any shapes or text hollow in a form as per the following code. Use a shape and fill a color and assign the same color to TransparencyKey property of the form.

namespace Hollow_Form
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            this.TransparencyKey = Color.Orange;
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixel;

            var text = "?????"; //I am using Tamil text here

            e.Graphics.DrawString(text, this.Font, Brushes.Orange, new PointF(10, 10));

            e.Graphics.FillEllipse(Brushes.Orange, new Rectangle(100, 100, 100, 100));
           
        }
    }
}

Output Screen:



Regards,
Selva Ganapathy K