ขึ้น error ครับ ช่วยหน่อยครับพี่น้อง ??????????????????

stringbuider  sb = new  stringbuider();

sb.remove(0,sb.length );
sb.append("insert into person ");
sb.append(" (id,title,firstname,lastname,address,tel)");
sb.append(" values('" + id + "',");
sb.append("'" + firstname + "',");
sb.append("'" + lastname + "',");
sb.append("'" + address + "',");
sb.append("'" + tel + "')");

strSQL = sb.tostring();
{
...
command.text = strsql;
...

}