MSSQL to C#

I have a MSSQL table in which the news will be stored
now if a new record is added to the db then my application will pop up a messagebox !

MyCode : This application will continuously check the database to see weather a new row is added if added then it will display a message box

my Question is; is this a good method ? or are there any other way to accomplish this ? please advice:pleased:

PHP:

        //start thread 
        private void Form1_Load(object sender, EventArgs e)
        {
            th1 = new Thread(new ThreadStart(tm_Tick));
            th1.Start();
        }
 
        thread dunction
        private void tm_Tick()
        {
            clsFetch db = new clsFetch();
            int x = db.maxPKID(); // get maximum primary key 
            int y = 0;
 
            try
            {
                while (_stopThreads == false)
                {
                    lock (this)
                    {
                        y = db.maxPKID();
                        if (y > x)
                        {
                            MessageBox.Show(db.getMessage(db.maxPKID));
                            x = y;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }