Create and collect ETW events from a custom EventSource

Program.cs

// Steps to run this sample:
// 1. Create a console app and replace Program.cs with this source
// 2. Build the app (for example with dotnet build). My exe is produced in 
//    "E:\temp\EventSourceSample\bin\Debug\net5.0\EventSourceSample.exe"
// 3. Download PerfView if you don't already have it: https://github.com/microsoft/perfview/blob/main/documentation/Downloading.md
// 4. In an admin command prompt, run this PerfView command substituting the path to your executable:
//    PerfView.exe -OnlyProviders:MyEventSource run E:\temp\EventSourceSample\bin\Debug\net5.0\EventSourceSample.exe
// 5. After PerfView finishes collecting, open the Events view and confirm that 1 event of type MyEventSource/HelloWorld was collected in
//    addition to the other events

using System;
using System.Diagnostics.Tracing;

namespace EventSourceSample
{
    class Program
    {
        static void Main(string[] args)
        {
            MyEventSource source = new MyEventSource();
            source.HelloWorld();
        }
    }

    [EventSource(Name="MyEventSource")]
    class MyEventSource : EventSource
    {
        [Event(1)]
        public void HelloWorld()
        {
            WriteEvent(1);
        }
    }
}