I am trying to retrive image from sql server database and display in picturebox. but this gives error. this is my code bellow.

Bitmap ByteArrayToImage(byte[] b)
        {
            MemoryStream ms = new MemoryStream();
            byte[] pData = b;
            ms.Write(pData, 0, Convert.ToInt32(pData.Length));
            Bitmap bm = new Bitmap(ms, false);//Parameter is not valid.
             ms.Dispose();
            return bm;
        }

        int ctr = 0;
        //int len = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            da = new SqlDataAdapter("select * from Slambook_Data where serial_no=" + textBox1.Text + "", con);
            ds = new DataSet();
            da.Fill(ds, "Slambook_Data");
            ctr = ds.Tables["Slambook_Data"].Rows.Count;
            if (ds.Tables["Slambook_Data"].Rows.Count > 0)
            {
                if (ds.Tables["Slambook_Data"].Rows[0]["photo"] != DBNull.Value)
                {
                    label1.Text = ds.Tables["Slambook_Data"].Rows[0]["name"].ToString();
                    pictureBox1.Image = ByteArrayToImage((Byte[])ds.Tables["Slambook_Data"].Rows[0]["photo"]);
                }
            }
        }