>I might be able to get a working example this weekend.
>
>

It looks like IE 9 has a bug for certain cases. JQuery lists it as closed "worksforme", however, it doesn't work for me.

Also, how can I create a custom annotation attribute? I want to set the dates to be future only.

I can do it this way:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;

namespace Socrates.Objects
{
    public class Engagement:IValidatableObject
    {
        public virtual int Id { get; set; }
        
        [Required]
        [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
        [DisplayName("Start Date")]
       [DataType(DataType.Date)]
        public virtual DateTime? StartDate { get; set; }

        [Required]
        [DataType(DataType.Date)]
        [DisplayName("End Date")]
        [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
        public virtual DateTime? EndDate { get; set; }

        public virtual Client Client { get; set; }
        public virtual Course Course { get; set; }

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            //string[] memberNames = new string[] { validationContext.MemberName };

            if ((EndDate==null) || (StartDate == null))
            {
                yield return new ValidationResult("StartDate or EndDate is null - something went terribly wrong!");
            }
            
            
            if (EndDate < StartDate)
            {
                yield return new ValidationResult("Class cannot end before it starts", new[]{"Engagement.EndDate"});
            }

            if (StartDate < DateTime.Now.Date)
            {
                yield return new ValidationResult("Start Date can not be in the past", new[] {"Engagement.StartDate"});
            }


            if (EndDate > StartDate.Value.AddMonths(1))
            {
                yield return new ValidationResult("You can not have a class longer than a month", new[]{"Engagement.EndDate"});
            }
        }


    }
}

but then the validation happen only after I press Create button. I want them to be right away.