How I can Use of timer in my code

 public partial class Form1 : Form
    {
        Timer tmr = null;
        public Form1()
        {
            InitializeComponent();
            tmr = new Timer();
            tmr.Interval = 2000; // 2000 milliseconds

            //Firing an event on every two seconds
            tmr.Tick += new EventHandler(tmr_Tick);

            // Starting the timer
            tmr.Start();
        }

        void tmr_Tick(object sender, EventArgs e)
        {
            // Disabling the timer while we copy the data from DB.
            tmr.Enabled = false;
            CopyDataFromDB();

            // Again enabling back timer to fire on next two seconds
            tmr.Enabled = true;
        }

        private void CopyDataFromDB()
        {
            try
            {
                SqlConnection source = new SqlConnection("Server = Rajan;User ID=abc;Password=123;Database=Test");

                SqlConnection destination = new SqlConnection("Server = santosh;User ID=india;Password=12345;Database=Book");

                SqlCommand cmd = new SqlCommand("delete from Book", destination);

                source.Open();

                destination.Open();

                cmd.ExecuteNonQuery();

                cmd = new SqlCommand("select * from Test", source);

                SqlDataReader reader = cmd.ExecuteReader();

                SqlBulkCopy bulkdata = new SqlBulkCopy(destination);

                bulkdata.DestinationTableName = "Book";

                bulkdata.WriteToServer(reader);

                bulkdata.Close();

                destination.Close();

                source.Close();
            }
            catch (Exception exc)
            {
                throw exc;
            }
        }

    }