C# attribute to check whether one date is earlier than the other

Question

I have a ViewModel for my MVC4 Prject containing two DateTime properties:

[Required]
[DataType(DataType.Date)]
public DateTime RentDate { get; set; }

[Required]         


        

Answer 1

Model:

[DateCorrectRange(ValidateStartDate = true, ErrorMessage = "Start date shouldn't be older than the current date")]
public DateTime StartDate { get; set; }

 [DateCorrectRange(ValidateEndDate = true, ErrorMessage = "End date can't be younger than start date")]
public DateTime EndDate { get; set; }

Attribute class:

[AttributeUsage(AttributeTargets.Property)]
    public class DateCorrectRangeAttribute : ValidationAttribute
    {
        public bool ValidateStartDate { get; set; }
        public bool ValidateEndDate { get; set; }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var model = validationContext.ObjectInstance as YourModelType;

            if (model != null)
            {
                if (model.StartDate > model.EndDate && ValidateEndDate
                    || model.StartDate > DateTime.Now.Date && ValidateStartDate)
                {
                    return new ValidationResult(string.Empty);
                }
            }

            return ValidationResult.Success;
        }
    }