using System;

using System.Collections.Generic;

​

public class c{

    public int i;

    public c(int ii){i=ii;}

    public void setI(int ii){i=ii;}

}

public struct s{

    public int i;

    public s(int ii){i=ii;}

    public void setI(int ii){i=ii;}

}

​

public class Program

{

    public static void Main()

    {

        var lc = new List<c>{new c(1)};

        var ls = new List<s>{new s(1)};

        lc.Find(_=>true).setI(2);

        ls.Find(_=>true).setI(2);

        Console.WriteLine("lc[0].i={0}",lc[0].i);

        Console.WriteLine("ls[0].i={0}",ls[0].i);

    }

}