using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<Class1> list1 = new List<Class1>();

        List<Class2> list2 = new List<Class2>();

        list1.Add(new Class1 { Name = "name1" });

        list1.Add(new Class1 { Name = "name2" });

        list2.Add(new Class2 { Name = "name2" });

        list2.Add(new Class2 { Name = "name3" });

        list2.Add(new Class2 { Name = "name1" });

        var distItems = list1.Select(s1 => new Class1 { Name = s1.Name }).Where(w => list2.Select(s2 => s2.Name).Contains(w.Name)).ToList();

        foreach(var item in distItems) {

            Console.WriteLine(item.Name);

        }

    }

}

​

class Class1

{

    public string Name;

}

​

class Class2

{

    public string Name;

}

​