saving picturebox image to sql server

hi,
I have a code below using c#. But wen I execute this code the error occur


strsql2.CommandText = "insert into hrattach(idkey,pb1)values(@idkey,@pb1)";
strsql2.Parameters.Add("@idkey",SqlDbType.NChar,6 );
strsql2.Parameters.Add("@pb1",SqlDbType.Image);
strsql2.Parameters["@idkey"].Value ="01019";
strsql2.Parameters["@pb1"].Value =picturebox1.Image; ' Error happens here
strsql2.CommandType = CommandType.Text;
strsql2.ExecuteNonQuery();

thanks
popskie

I dont know sql, but at least describe the error so someone who does may be able to help you better
what's the exact error message??

The error message is Object must Implement ICovertible.