How to get Mediumblob image and display it in picturebox? c#

Question

I tried this one but it's not working

                conn.connect();
                conn.cn.Open();
                command = new MySqlCommand("call getDoc_cSharp("+id+")", conn.cn);
                dr = command.ExecuteReader();
                while (dr.Read())
                {
                    byte[] raw = (byte[])dr[0];
                    MemoryStream ms = new MemoryStream(raw);
                    docu_image.Image = Image.FromStream(ms);
                }
                command.Dispose();
                conn.cn.Close();

I searched, tried, all possible solutions but it always says "Parameter is not valid" and other error messages also when i tried other solution. I've been stuck in here since yesterday, I can't get to display my mediumblob image to picturebox.