Discord.Net/docs/guides/samples/intro/logging.cs

using Discord;
using System;
using System.Threading.Tasks;

namespace MyBot
{
	public class Program
	{
		public static void Main(string[] args)
			=> new Program().MainAsync().GetAwaiter().GetResult();

		public async Task MainAsync()
		{
		}

		private Task Log(LogMessage msg)
		{
			Console.WriteLine(msg.ToString());
			return Task.CompletedTask;
		}
	}
}