Event invocation demo

test.cs

using System;
using System.Threading;

class Program
{
	static event EventHandler Handler;

	static void Main()
	{
		Handler += (s, e) => { Console.WriteLine($"1: {Thread.CurrentThread.ManagedThreadId}"); };
		Handler += (s, e) => { Console.WriteLine($"2: {Thread.CurrentThread.ManagedThreadId}"); };
		Handler += (s, e) => { Console.WriteLine($"3: {Thread.CurrentThread.ManagedThreadId}"); };
		Handler += (s, e) => { Console.WriteLine($"4: {Thread.CurrentThread.ManagedThreadId}"); };
		Handler += (s, e) => { Console.WriteLine($"5: {Thread.CurrentThread.ManagedThreadId}"); throw new Exception(); };
		Handler += (s, e) => { Console.WriteLine($"6: {Thread.CurrentThread.ManagedThreadId}"); };

		Handler(null, EventArgs.Empty);
	}
}

// output:
// 1: 1
// 2: 1
// 3: 1
// 4: 1
// 5: 1
// Unhandled exception: System.Exception: (...)