insert into image type ole object C# Access windowsapp

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                byte[] img = null;
                FileStream fs = new FileStream(pic, FileMode.Open, FileAccess.Read);
                BinaryReader br = new BinaryReader(fs);
                img = br.ReadBytes((int)fs.Length);
                string sql = "insert into test (ID,Username,Pic) VALUES("+textBox1.Text+"'+'"+textBox2.Text+"',@pic)";

                if (con.State != ConnectionState.Open) con.Open();

                cmd = new OleDbCommand(sql, con);
                cmd.Parameters.Add(new OleDbParameter("@pic", img));
                int x = cmd.ExecuteNonQuery();
                con.Close();
                MessageBox.Show(x.ToString()) ;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }