Task in C#:

Task.cs

using System;
using System.Threading.Tasks;

namespace TaskExample
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Create and start tasks
            Task task1 = Task.Run(() => {
                Console.WriteLine("Task 1 is running.");
                System.Threading.Thread.Sleep(2000);
            });
            Task task2 = Task.Run(() => {
                Console.WriteLine("Task 2 is running.");
                System.Threading.Thread.Sleep(1000);
            });

            // Wait for all tasks to complete
            Task.WaitAll(task1, task2);

            Console.WriteLine("All tasks have completed.");
        }
    }
}