Event comparison

Test.cs

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace FluxSwiss.Auctioning.Intranet.UnitTests
{
    [TestClass]
    public class Test
    {
        public event EventHandler<string> NonEmptyEvent = delegate { };
        public event EventHandler<string> EmptyEvent;

        private int count = 70000000;

        // Execution time: ~271ms
        [TestMethod]
        public void NonEmptyEventTest()
        {
            for (var i = 0; i < count; i++)
                NonEmptyEvent(this, "some data");
        }

        // Execution time: ~191ms
        [TestMethod]
        public void EmptyEventTest()
        {
            for (var i = 0; i < count; i++)
                EmptyEvent?.Invoke(this, "some data");
        }

        // Execution time: ~969ms
        [TestMethod]
        public void NonEmptyEventTest_WithSingleSubscription()
        {
            // Subscribe
            var variable = string.Empty;
            NonEmptyEvent += (sender, args) =>
            {
                if (sender == this)
                {
                    variable = args;
                }
            };

            NonEmptyEventTest();
        }

        // Execution time: ~483ms
        [TestMethod]
        public void EmptyEventTest_WithSingleSubscription()
        {
            // Subscribe
            var variable = string.Empty;
            EmptyEvent += (sender, args) =>
            {
                if (sender == this)
                {
                    variable = args;
                }
            };

            EmptyEventTest();
        }
    }
}