Memorystream - OutOfMemoryException

Question

It might be that this question has been answered before, but I found no good solution to my problem.

I am trying to convert a Bitmap to a bytearray using a memory stream, but when I do so I get an out of memory exception, and I can't figure out where and what is going wrong. Below you can find my code, and I would be very grateful for any insight on the topic.

static byte[] convertBmpToByteArray(string imageFilePath)
    {
        Bitmap bmpImg = (Bitmap)Bitmap.FromFile(imageFilePath);
        try
        {
            using (MemoryStream ms = new MemoryStream())
            {
                bmpImg.Save(ms, ImageFormat.Bmp);

                return ms.ToArray();
            }
        } catch(Exception e)
        {
            Console.WriteLine(e.StackTrace);
            return null;
        }
    }