i am unable to understand that why this method is not updating database while no error no exception is getting

public void updatelocation(String newloc, String cservice, String cno)
{
    try
    {
        SQLiteDatabase  sdb=getWritableDatabase();
        String where=Table_info.Courier_service+ " LIKE ? AND "+Table_info.Courier_no +" LIKE ?";
        String[] whereArgs=new String[]{"BLUE DART","BD01"};
        System.out.println(whereArgs);
        ContentValues cv=new ContentValues();
        cv.put(Table_info.Location, newloc);
        sdb.update(Table_info.Table_Name, cv, where, whereArgs);
        Log.v("server Data", "Updation Successful");
        sdb.close();
    }
    catch(Exception e)
    {
        System.out.println("update method error:"+e.getMessage());
    }

}