using System.Threading.Tasks;
public static void Main()
Console.WriteLine("Hello World");
public static async void callMain()
Console.WriteLine(File.ReadAllText("test.txt"));
public static async Task<bool> callFunc(int x)
using var streamWriter = new StreamWriter("test.txt", true);
for(int i = 0; i<10000; i++)
streamWriter.WriteLineAsync(s).GetAwaiter().GetResult();