C# How to run code at given time? [closed]

Answer 1

I asked this question because I thought using a timer is not the best solution (comparing the current time periodically to the time I need to run the task)

Why? why not timer a best solution? IMO timer is the best solution. but not the way you have implemented. Try the following.

private System.Threading.Timer timer;
private void SetUpTimer(TimeSpan alertTime)
{
     DateTime current = DateTime.Now;
     TimeSpan timeToGo = alertTime - current.TimeOfDay;
     if (timeToGo < TimeSpan.Zero)
     {
        return;//time already passed
     }
     this.timer = new System.Threading.Timer(x =>
     {
         this.ShowMessageToUser();
     }, null, timeToGo, Timeout.InfiniteTimeSpan);
}

private void ShowMessageToUser()
{
    if (this.InvokeRequired)
    {
        this.Invoke(new MethodInvoker(this.ShowMessageToUser));
    }
    else
    {
        MessageBox.Show("Your message");
    }
}

Use it like this

 SetUpTimer(new TimeSpan(17, 45, 00));