database image field passing null value

Question

How to pass null value to database field having type of image. I am trying this but getting an error:

if (photo)
    cmd.Parameters.AddWithValue("EPhotograph",img);
else
    cmd.Parameters.AddWithValue("EPhotograph", "");
if (signn)
    cmd.Parameters.AddWithValue("ESignature",sign);
else
    cmd.Parameters.AddWithValue("ESignature",DBNull.Value);

Answer 1

Instead of DBNull.Value please try to put empty byte array like this new byte[0];

Reason SQL image type requires byte array as value in them.