using System;

using System.ComponentModel.DataAnnotations;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var model = new ViewModel();

        var results = new List<ValidationResult>();

        if (!Validator.TryValidateObject(model, new ValidationContext(model), results)) {

            Console.WriteLine("Model is not valid:");

            foreach (var r in results) {

                Console.WriteLine(r.ErrorMessage);

            }

        } else {

            Console.WriteLine("Model is valid");

        }

    }

}

​

public class ViewModel

{

    [Required]

    public string PropertyOne { get; set; }

    [Required]

    public string PropertyTwo { get; set; }

}