// Online C# Editor for free

// Write, Edit and Run your C# code using C# Online Compiler

​

using System;

using System.ComponentModel.DataAnnotations;

using System.Collections.Generic;

using System.Linq;

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        TestClass t = new TestClass(){ Status = 2 };

        ICollection<ValidationResult> results = null;

        if (!Validate(t, out results))

        {    

            Console.WriteLine(String.Join("\n", results.Select(o => o.ErrorMessage)));    

        }    

        else    

        {    

            Console.WriteLine("I'm a valid object!");    

        }    

        Console.WriteLine ();

    }

    static bool Validate<T>(T obj, out ICollection<ValidationResult> results)    

    {    

        results = new List<ValidationResult>();    

​

        return Validator.TryValidateObject(obj, new ValidationContext(obj), results, true);    

    }  

}

public class TestClass

{

    [Required]

    [Range(1,3)]

    public int Status {get;set;}

}