System.IO.MemoryStream currentStream = new System.IO.MemoryStream();
            int w = XXXX;
            int h = XXXX;
            IntPtr deviceContextHandle;
            Graphics offScreenBufferGraphics;

            Graphics graphics = null;

            Metafile currentMetafile;
            using (offScreenBufferGraphics = Graphics.FromHwndInternal(IntPtr.Zero))
            {
                deviceContextHandle = offScreenBufferGraphics.GetHdc();
                currentMetafile = new Metafile(
                    currentStream,
                    deviceContextHandle,
                    new RectangleF(0, 0, w, h),
                    MetafileFrameUnit.Pixel,
                    EmfType.EmfOnly);

                offScreenBufferGraphics.ReleaseHdc();

                graphics = Graphics.FromImage(currentMetafile);

                graphics.PageUnit = GraphicsUnit.Inch;
                graphics.SetClip(new RectangleF(0, 0, w, h));
            }
            graphics.PageUnit = GraphicsUnit.Pixel;

         // Рисуем всякое

         graphics.Dispose();

            byte[] bytes = ms.ToArray();
            using (FileStream file = File.OpenWrite(fileName.ToString()))
            {
                file.Write(bytes, 0, bytes.Length);
            }
        }