Asynchronous programming in C#

using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace NationalParks
{
    class Program
    {
        static async Task Main(string[] args)
        {
            string url = "https://example.com";
            string result = await FetchDataAsync(url);
            Console.WriteLine(result);
        }

        static async Task<string> FetchDataAsync(string url)
        {
            using (HttpClient client = new HttpClient())
            {
                HttpResponseMessage response = await client.GetAsync(url);
                response.EnsureSuccessStatusCode();
                return await response.Content.ReadAsStringAsync();
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace NationalParks
{
    class Program
    {
        static async Task Main(string[] args)
        {
            List<Task> tasks = new List<Task>
            {
                Task.Run(() => ProcessData("Yellowstone")),
                Task.Run(() => ProcessData("Yosemite")),
                Task.Run(() => ProcessData("Zion"))
            };

            await Task.WhenAll(tasks);
            Console.WriteLine("All tasks completed.");
        }

        static void ProcessData(string parkName)
        {
            Console.WriteLine($"Processing data for {parkName}");
            // Simulate work
            Task.Delay(1000).Wait();
            Console.WriteLine($"{parkName} processing completed.");
        }
    }
}