Linqの理解用

linqtest.cs

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

namespace linqtest
{
    public class hoge{
        public string id;
        public int value;
    }

    public class Class1
    {
        public void hoge()
        {
            List<hoge> Ulist = new List<hoge>();
            string fuga = Ulist.Single(n => n.id == "1").id;

        }
    }
}