[quot skyANA]А ты как пожаришь на IValidatableObject сковороде?[/quot]
public class Register : IValidatableObject
{
    [DataType(DataType.Text)]
    [Display(Name = "District Name")]
    [Required(AllowEmptyStrings = false, ErrorMessage = "You must enter a District Name")]
    [StringLength(40, MinimumLength = 1, ErrorMessage = "District Name must be between 1 and 40 characters")]
    public string DistrictName { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "Url Quick Find")]
    [Required(ErrorMessage = "You must provide a Quick Find Name")]
    [StringLength(15, MinimumLength = 3, ErrorMessage = "Url Quick Find must be between 3 and 15 characters")]
    public string QuickFind { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "User name")]
    [Required(AllowEmptyStrings = false, ErrorMessage = "User name is requred")]
    [StringLength(10, MinimumLength = 1, ErrorMessage = "Url Quick Find must be between 1 and 10 characters")]
    public string Username { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Password")]
    [Required(AllowEmptyStrings = false, ErrorMessage = "Password is requred")]
    public string Password { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Re-Enter Password")]
    [Required(AllowEmptyStrings = false, ErrorMessage = "You must re-enter your password to confirm you have entered it correctly")]
    public string PasswordConfirm { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "Display Name")]
    [Required(AllowEmptyStrings = false, ErrorMessage = "Display Name is requred")]
    [StringLength(20, MinimumLength = 1, ErrorMessage = "Display Name must be between 1 and 20 characters")]
    public string DisplayName { get; set; }

    [DataType(DataType.EmailAddress)]
    [Display(Name = "Email Address")]
    [Required(AllowEmptyStrings = false, ErrorMessage = "Email Address is requred")]
    [StringLength(50, MinimumLength = 4, ErrorMessage = "Email Address must be between 4 and 50 characters")]
    public string EmailAddress { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        Regex lettersOnly = new Regex("^[a-zA-Z]*$");

        if (!lettersOnly.IsMatch(QuickFind))
            yield return new ValidationResult("Only letters A - Z are allowed in the Quick Find", new string[] { "QuickFind" });

        if (!lettersOnly.IsMatch(QuickFind))
            yield return new ValidationResult("Only letters A - Z are allowed for your User name", new string[] { "Username" });

        if (Password != PasswordConfirm)
            yield return new ValidationResult("Passwords do not match", new string[] { "Password", "PasswordConfirm" });

    }
}