C#

using System;
using System.Windows.Forms;
using System.Timers;

namespace T_TEST
{
    public partial class Form1 : Form
    {
        static System.Timers.Timer timer;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            schedule_Timer();
        }

        static void schedule_Timer()
        {
            Console.WriteLine("### Timer Started ###");

            DateTime nowTime = DateTime.Now;
            DateTime scheduledTime = new DateTime(nowTime.Year, nowTime.Month, nowTime.Day, 1, 59, 0, 0); //Specify your scheduled time HH,MM,SS [1am and 59 minutes]
            if (nowTime > scheduledTime)
            {
                scheduledTime = scheduledTime.AddDays(1);
            }

            double tickTime = (double)(scheduledTime - DateTime.Now).TotalMilliseconds;
            timer = new System.Timers.Timer(tickTime);
            timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);
            timer.Start();
        }

        static void timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            //Console.WriteLine("### Timer Stopped ### \n");
            timer.Stop();
            MessageBox.Show("Hello World!!!");
            //Console.WriteLine("### Scheduled Task Started ### \n\n");
            //Console.WriteLine("Hello World!!! - Performing scheduled task\n");
            //Console.WriteLine("### Task Finished ### \n\n");
            schedule_Timer();
        }
    }
}

            Thread.Sleep(1000);
            Debug.Print("are in Try and i: " + i);

            //if (chkErr.Checked == true)
            //{ iErr = "E"; }
        }
        catch (Exception ex)
        {
             Debug.Print("are in Catch and i: " + i + " ex: " + ex.Message);
             //If an error occurs this place, why not escape to run i next catch ?
        }

        i++;
    }// Loop 1
}//Loop 2