RichardD2

    public static class IQueryableExtensions
    {
        private readonly struct HalfList<T>
        {
            private readonly IReadOnlyList<T> _list;
            private readonly int _startIndex;

            private HalfList(IReadOnlyList<T> list, int startIndex, int count)
            {

RichardD2

using System;
using System.ComponentModel;
using System.Net.Mail;
using System.Threading;
using System.Threading.Tasks;

public static class SmtpClientExtensions
{
    /// <summary>
    /// Sends the specified message to an SMTP server for delivery as an asynchronous operation.