string str="14.1.6.2839";
            List<Version> versions = new List<Version>
            {new Version(str),
                new Version("14.2.0.0"),new Version("14.1.11.0"),new Version("14.2.4.0")
            };
            if(versions[0].CompareTo(versions[2])>=0||(versions[0].CompareTo(versions[1]) >= 0)&& versions[0].CompareTo(versions[0])<0)
            Console.WriteLine("new Version");
            else
                Console.WriteLine("old Version");