Bitmap contains pixel data for a graphics image. You can save bitmap to GDI+ file formats: BMP, GIF, EXIF, JPG, PNG and TIFF.
Example
Create new bitmap in runtime
Bitmap bmp = new System.Drawing.Bitmap(200, 200);
for (int x = 0; x < bmp.Height; ++x)for (int y = 0; y < bmp.Width; ++y)
bmp.SetPixel(x, y, Color.Coral );
for (int x = 0; x < bmp.Height / 2; ++x)
for (int y = 0; y < bmp.Width / 2; ++y)
bmp.SetPixel(x, y, Color.Blue );
pictureBox1.Image = bmp;