With primitive obsession

Customer.cs

public class Customer
{
    public string Name { get; private set; }
    public string Email { get; private set; }

    public Customer(string name, string email)
    {
        // Validate name
        if (string.IsNullOrWhiteSpace(name) || name.Length > 50)
            throw new ArgumentException("Name is invalid");

        // Validate e-mail
        if (string.IsNullOrWhiteSpace(email) || email.Length > 100)
            throw new ArgumentException("E-mail is invalid");
        if (!Regex.IsMatch(email, @"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$"))
            throw new ArgumentException("E-mail is invalid");

        Name = name;
        Email = email;
    }

    public void ChangeName(string name)
    {
        // Validate name
        if (string.IsNullOrWhiteSpace(name) || name.Length > 50)
            throw new ArgumentException("Name is invalid");

        Name = name;
    }

    public void ChangeEmail(string email)
    {
        // Validate e-mail
        if (string.IsNullOrWhiteSpace(email) || email.Length > 100)
            throw new ArgumentException("E-mail is invalid");
        if (!Regex.IsMatch(email, @"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$"))
            throw new ArgumentException("E-mail is invalid");

        Email = email;
    }
}

CustomerController.cs

public class CustomerController : Controller
{
    [HttpPost]
    public ActionResult CreateCustomer(CustomerInfo customerInfo)
    {
        if (!ModelState.IsValid)
            return View(customerInfo);

        Customer customer = new Customer(customerInfo.Name, customerInfo.Email);
        // Rest of the method
    }
}

CustomerInfo.cs

public class CustomerInfo
{
    [Required(ErrorMessage = "Name is required")]
    [StringLength(50, ErrorMessage = "Name is too long")]
    public string Name { get; set; }

    [Required(ErrorMessage = "E-mail is required")]
    [RegularExpression(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$", 
        ErrorMessage = "Invalid e-mail address")]
    [StringLength(100, ErrorMessage = "E-mail is too long")]
    public string Email { get; set; }
}