How to loop once on the end of a timer in C#?

Question

C++ / C#

How to make the timer run only 1 time and after it ends, the loop is executed
(only 1 time)?

The code:

NetworkChat.sendAlert("Airdrop will fall to the Summerside Peninsule after 5 min!");
airdrop = new System.Timers.Timer(300000);
airdrop.Elapsed += AirdropElapsed;
while (AirdropElapsed.istrue == true)
{
  NetworkChat.sendAlert("Airdop was fallen to Summerside Peninsula!");
  Vector3 summerside = new Vector3(790, 24, -450);
           int[] array2 = array;
          foreach (int num in array2)
          {
            SpawnItems.spawnItem(num, 1, summerside);
          }
          NetworkChat.sendAlert(messageAfterDrop);
}
airdrop.Enabled = false;

A photo:

Answer 1

Create a thread that will call the function 1 time, then sleep for an interval and call the function again. And no timer needed