How to use dataannotation validation in asp.net mvc

Question

I need your help, I have wrote this class to hold the data, here in my example I used the DataAnnotation for validation, unfortunately I entered in invalid email address but it did not object so I am confused about what is the correct way to use the DataAnnotations

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
namespace workflow.DataHolders
{
    public class NewCompany
    {
        [Required]
        [StringLength(200, MinimumLength = 3, ErrorMessage="Length Should  Be More Than Three Letters")]
        public string CompanyName { get; set; }

        [Required]
        [EmailAddress(ErrorMessage="Invalid Email Address")]
        public string Email { get; set; }

        [Required]
        [StringLength(200, MinimumLength = 2, ErrorMessage = "Length Should  Be More Than Two Letters")]
        public string Country { get; set; }

        public string Description { get; set; }
    }
}

Answer 1

We have two way to do this

1st Way

[RegularExpression(@"\A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)\Z", ErrorMessage = "Invalid Email Address")]
public string email { get; set; }

2nd Way

 [DataType(DataType.EmailAddress)]
 [Email]
 public string email { get; set; }