How to display the name of the countries through the API?

Question

C++ / C#

The essence of the task is as follows: It is
necessary to create an application in which the user, by entering the name of the country, will receive various information about it (Capital, Area, etc.)
I found RESTCountries.NET on the Internet, but when I request to display all countries, nothing happens, which I am I not doing that? Please help me understand
Here is an example code:

using RESTCountries.Models;
using RESTCountries.Services;
    class Program
    {
        static void Main(string[] args)
        {
            Test();
        }
        static async void Test()
        {
            List<Country> countries = await RESTCountriesAPI.GetAllCountriesAsync();
            Console.WriteLine(countries.Count);
        }
    }

Answer 1

To begin, await Test(); in the Main() method - otherwise the program ends without waiting for the completion of the asynchronous operation.
And the signature of Main in this case will be the following - static async Task Main(string[] args).

Answer 2

You need to learn about asynchrony.
How returning void differs from Task in async methods

static void Main(string[] args)
        {
           Task.WaitAll(Test());
        }
        static async Task Test()
        {
            List<Country> countries = await RESTCountriesAPI.GetAllCountriesAsync();
            Console.WriteLine(countries.Count);
        }