using System;

using FluentValidation;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var music = new Music();

        var validator = new Validator();

        var retults = validator.Validate(music);

        Console.WriteLine($"{retults}");

    }

    public class Music {

        public Guid MainId {get;set;}

        public Guid? SecondId {get;set;} = null;

        public string MyEmptyString {get;set;} = string.Empty;

        public string MyNullString {get;set;} = null;

        public string MyWhiteSpaceString {get;set;} = "    ";

    }

    public class Validator : AbstractValidator<Music>

        {

            public Validator()

            {

                RuleFor(x => x.MainId).NotEqual(Guid.Empty).WithMessage("RuleFor(x => x.MainId).NotEqual(Guid.Empty)");

                RuleFor(x => x.MainId).NotEmpty().WithMessage("RuleFor(x => x.MainId).NotEmpty()");

                RuleFor(x => x.SecondId).NotEmpty().WithMessage("RuleFor(x => x.SecondId).NotEmpty()");

                RuleFor(x => x.MyEmptyString).NotEmpty().WithMessage("RuleFor(x => x.MyEmptyString).NotEmpty()");

                RuleFor(x => x.MyNullString).NotEmpty().WithMessage("RuleFor(x => x.MyNullString).NotEmpty()");

                RuleFor(x => x.MyWhiteSpaceString).NotEmpty().WithMessage("RuleFor(x => x.MyWhiteSpaceString).NotEmpty()");

            }

        }

}