Question : runtime error when creating image from stream of bytes (Parameter is not valid)

hi,
I have got a runtime error why creating image from a stream of bytes,
the error is Parameter is not valid.
here is my code:

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byte[] aAnsi = (byte[])ConvertSample.ConvertToANSI381(pSample);
            try
            {
                MemoryStream ms = new MemoryStream(aAnsi);
                Image returnImage = Image.FromStream(ms);
                pictureBox1.Image = returnImage;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

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Question : runtime error when creating image from stream of bytes (Parameter is not valid)

Answer : runtime error when creating image from stream of bytes (Parameter is not valid)

That means that the byte array doesn't represent a valid image.