using System;

using NuGet.Versioning;

public class Program

{

    public static void Main()

    {

        void Test(string a, string b)

        {

            var result1 = new VersionComparer().Compare(new NuGetVersion(a), new NuGetVersion(b));

            var result2 = StringComparer.InvariantCulture.Compare(a, b);

            string Op(int i) => i switch { 1=>">",-1=>"<",0=>"0" };

            Console.WriteLine($"NuGetVersion: {a}{Op(result1)}{b} - String: {a}{Op(result2)}{b}");

        }

​

        Test("2.1.0-preview.1", "2.1.0-preview.2");

        Test("2.1.0-preview.2", "2.1.0-preview.1");

        Test("2.1.0-preview.10", "2.1.0-preview.9");

    }

}