C#: How to produce a vector graphic

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;

class CreateMetafileMemory : Form
{
    MemoryStream ms = new MemoryStream();
    Graphics g;

    public static void Main()
    {
        Application.Run(new CreateMetafileMemory());

    }

    public CreateMetafileMemory()
    {
        Graphics grfx = CreateGraphics();
        MemoryStream ms = new MemoryStream();
        IntPtr ipHdc = grfx.GetHdc();

        Metafile mf = new Metafile(ms, ipHdc);
        grfx.ReleaseHdc(ipHdc);
        grfx.Dispose();
        grfx = Graphics.FromImage(mf);

        grfx.FillEllipse(Brushes.Gray, 0, 0, 100, 100);
        grfx.DrawEllipse(Pens.Black, 0, 0, 100, 100);
        grfx.DrawArc(new Pen(Color.Red, 10), 20, 20, 60, 60, 30, 120);
        grfx.Dispose();
        mf.Save(@"C:\file.emf", ImageFormat.Emf);
        mf.Save(@"C:\file.wmf", ImageFormat.Wmf);
    }
}