EMF изображение в поток Stream

            MemoryStream ms = new MemoryStream();
 
            if (pictureBox2.Image.RawFormat.Equals( System.Drawing.Imaging.ImageFormat.Emf ))
                pictureBox2.Image.Save( ms, System.Drawing.Imaging.ImageFormat.Emf ); //<-- здесь ошибка
            else if (pictureBox2.Image.RawFormat.Equals( System.Drawing.Imaging.ImageFormat.Bmp ))
                pictureBox2.Image.Save( ms, System.Drawing.Imaging.ImageFormat.Bmp );

     
 System.IO.MemoryStream stream = new System.IO.MemoryStream();
MSChart.SaveImage(stream, System.Drawing.Imaging.ImageFormat.Emf);
             byte[] emfData = (byte[])stream.GetBuffer();
             System.IO.MemoryStream ms = new System.IO.MemoryStream(emfData);
             Metafile p = new Metafile(ms);

MSChart.SaveImage(stream, System.Drawing.Imaging.ImageFormat.Emf);

pictureBox.Image.Save(stream, System.Drawing.Imaging.ImageFormat.Emf);

[System.Runtime.InteropServices.DllImport("gdi32")]        public static extern int GetEnhMetaFileBits(int hemf, int cbBuffer, byte[] lpbBuffer); 
 
 
        public static void SaveMetafile(Metafile mf, string fileName)
        {
            int enhMetafileHandle = mf.GetHenhmetafile().ToInt32();
            int bufferSize = GetEnhMetaFileBits(enhMetafileHandle, 0, null); // Get required buffer size.
            byte[] buffer = new byte[bufferSize]; // Allocate sufficient buffer
            if(GetEnhMetaFileBits(enhMetafileHandle, bufferSize, buffer) <= 0) // Get raw metafile data.
                throw new SystemException("DoTheTrick.GetEnhMetaFileBits");
            using(FileStream ms = File.Open(fileName, FileMode.Create))
                ms.Write(buffer, 0, bufferSize);
        }