How to generate event on a specific time of clock in C#?

Question

How can i generate an event on a specific time say i want to generate alert at 8:00 AM that its 8:00 AM and on any given time of clock

Answer 1

Use the Timer class:

var dt = ... // next 8:00 AM from now
var timer = new Timer(callback, null, dt - DateTime.Now, TimeSpan.FromHours(24));

The callback delegate will be called the next time it's 8:00 AM and every 24 hours thereafter.

See this SO question how to calculate the next 8:00 AM occurrence.

Answer 2

private void Run_Timer()
    {
        DateTime tday = new DateTime();
        tday = DateTime.Today;
        TimeSpan Start_Time = new TimeSpan(8,15,0);
        DateTime Starter = tday + Start_Time;
        Start_Time = new TimeSpan(20, 15, 0);
        DateTime Ender = tday + Start_Time;
        for (int i = 0; i <= 23; i++)
        {
            Start_Time = new TimeSpan(i, 15, 0);
            tday += Start_Time;
            if (((tday - DateTime.Now).TotalMilliseconds > 0) && (tday >= Starter) && (tday <= Ender))
            {
                Time_To_Look = tday;
                timer1.Interval = Convert.ToInt32((tday - DateTime.Now).TotalMilliseconds);
                timer1.Start();
                MessageBox.Show(Time_To_Look.ToString());
                break;
            }
        }
    }

We can use this function for getting timer running for times or change it to run on a specific time :D

Answer 3

Use a Scheduled Task to generate the alert.