using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class Test
{
	public static void Main()
	{
		List<User> users = new List<User>();
		
		for(int i = 0; i < 10; i++)
		{
			User user = new User();
			user.ID = i;
			user.FName = "User" + i.ToString();
			user.LName = "LName" + i.ToString();
			users.Add(user);
		}
		
		User filtered = users.Single(x => x.ID == 5);
		Console.WriteLine(filtered.FName + " - " + filtered.LName);
	}
}

public class User
{
	public int ID { get; set; }
    public string FName { get; set; }
    public string LName { get; set; }
}