Parameter is not valid.

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ASP.NET

I have stored jpeg images in database table. Now I want to retrieve them. here is the code

MemoryStream stream = new MemoryStream();
try
{
    cnn.Open();
    cmd = new SqlCommand("select pics from images", cnn);
    byte[] image = (byte[])cmd.ExecuteScalar();
   
    stream.Write(image, 0, image.Length);
    Bitmap bitmap = new Bitmap(stream);
    Response.ContentType = "image/gif";
    bitmap.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Bmp);
}
finally
{
    cnn.Close();
    stream.Close();
}

but when i run the application it gives me the following error

Parameter is not valid.
Bitmap bitmap = new Bitmap(stream);

can somebody tells me what i need to correct.