Question

If i want my application to do something every 2hr (eg. pop up a message), how do i do that?

Do i program that set of code under onLoad() or somewhere else?

Answer 1

Assuming WinForms.

You should use Windows Timer Class

Drag and drop timer component to your form.

Set interval to 7200000 (2 * 60 * 60 * 1000) milliseconds.

Subscribe to Tick event (the only event that this component has).

private void timer1_Tick(object sender, EventArgs e)
{
    MessageBox.Show("Example");
}

The code inside of timer will be triggered every 2 hours, if UI thread is not blocked.