C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace mfwmp
{
    public partial class Form1 : Form, IMessageFilter
    {
        public Form1()
        {
            InitializeComponent();
            Application.AddMessageFilter(this);
        }
    }
}
//Error	1	'mfwmp.Form1' does not implement interface member //'System.Windows.Forms.IMessageFilter.PreFilterMessage(ref System.Windows.Forms.Message)'	

public IEnumerable<Guid> GetIds(int count, DateTime time)
        {
            
            Console.WriteLine("Start");
            {
                if (DateTime.Now > time)
                    yield break;
                else
                    yield return Guid.NewGuid();
            }
            Console.WriteLine("End");
        }