RiaTasks: Central Silverlight Business Rules Validation

using FluentValidation;
using System;

namespace RIATasks.Web
{
    // This validator will be used for all operations on the Tasks table
    public class TaskValidator : AbstractValidator<Task>
    {
        // Thses rules ensure that you always have a Name and Description for a Task
        public TaskValidator()
        {
            RuleFor(Task => Task.TaskName).NotEmpty()
                .WithMessage("Please specify Task Name");
            RuleFor(Task => Task.TaskDescription).NotEmpty()
                .WithMessage("Please specify Task Description");            
        }
    }

    // This validator will only be used for Insert operations on the Tasks table
    public class TaskInsertValidator : AbstractValidator<Task>
    {
        public TaskInsertValidator()
        {
            // When inserting the date must be null or in the future
            RuleFor(Task => Task.DueDate).Must(BeADateInTheFuture)
                .WithMessage("Please specify a date that has not already passed");
        }

        // If a non-null date is entered make sure it is in the future
        private bool BeADateInTheFuture(DateTime? dtCurrentDate)
        {
            DateTime dtDateInTheFuture = DateTime.Now.AddDays(1);
            return ((dtCurrentDate ?? dtDateInTheFuture) >= DateTime.Now.AddDays(-1));
        }
    }
}