using System;

using System.Collections.Generic;                   

public class Program

{

    public static void Main()

    {

            List<Version> appVersionEntities = new List<Version>() { new Version("3.0"), new Version("2.0"), new Version("4.0"), new Version("1.0"), new Version("5.0") };

            Version previousVersion = new System.Version();

            Version curVersion = new Version("3.0");

            foreach (var appVersionEntity in appVersionEntities)

            {

                var appVersion = appVersionEntity;

                if (curVersion > appVersion && curVersion > previousVersion)

                {

                    previousVersion = appVersion;

                }

            }

​

            Console.WriteLine(previousVersion); 

    }

}