What are the reasons for a C# timer to only execute once?

There are a few reasons why a C# Timer only executes once.

1. Timer expiration: You can specify the interval time of the timer by setting the Interval property of the Timer. When the timer reaches the specified interval time, it will trigger execution once.
2. The timer can be started by calling the Start method of the Timer, when started it will immediately execute once.
3. Restarting the timer: The timer can be restarted by calling the Restart method of Timer, which will immediately execute once it is restarted.
4. Manual trigger: You can manually trigger execution by calling the Tick event or the Elapsed event of the Timer.