draw a ellipse on an image

Graphics xGraph;

int k;

int r; 

int x, y; 

Bitmap DrawArea;

DrawArea = new Bitmap(Width,Height,System.Drawing.Imaging.PixelFormat.Format24bppRgb);

xGraph = Graphics.FromImage(DrawArea);

Random rnd = new Random((int)DateTime.Now.Ticks); // seeded with ticks

Pen myPen = new Pen(Color.Red);

// Drawing random circles in the bitmap image area

myPen.Color = Color.FromArgb(

(rnd.Next(0, 255)),

(rnd.Next(0, 255)),

(rnd.Next(0, 255)));

System.Drawing.Image image= System.Drawing.Image.FromFile("C:\abc.jpg");

xGraph.DrawImage(image, 0, 0, DrawArea.Width, DrawArea.Height, System.Drawing.GraphicsUnit.Pixel);

xGraph.DrawEllipse(myPen, x - r, y - r, r, r); 

DrawArea.Save("C:\\abc.bmp");

xGraph.Dispose();

DrawArea.Dispose();