TaskScheduler.UnobservedTaskException - https://stackoverflow.com/a/23505426/1768303

UnobservedTaskExceptionDemo.cs

using System;
using System.Linq;
using System.Threading.Tasks;

namespace UnobservedTaskExceptionDemo
{
	class Program
	{
		static void Main(string[] args)
		{
			TaskScheduler.UnobservedTaskException += (s, e) =>
			{
				Console.WriteLine("UnobservedTaskException");
			};

			Enumerable.Range(1, 10).Select(i =>
				Task.Run(() => { if (i % 2 != 0) throw new InvalidOperationException(); })).ToArray();

			Console.WriteLine("Before GC...");
			Console.ReadKey();
			GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, blocking: true);
			Console.WriteLine("After GC...");
			Console.ReadKey();
		}
	}
}