I want to create an image in C#, red ellipse with transparent surroundings. What do I need to add to the code below to get the area around my ellipse to be transparent. I will later use this image on top of another image.
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(100, 100);
Graphics g = Graphics.FromImage(bitmap);
SolidBrush mySolidBrush = new SolidBrush(System.Drawing.Color.Red);
g.FillEllipse(mySolidBrush, 0, 0, 100, 100);