小编ful*_*dau的帖子

我很难使它起作用。我要允许用户选择start date和end date，如果start date大于end date我希望显示错误消息。我正在使用MVC。这是我模型上的代码。

 public class ModelClass : IValidatableObject
{
    [Required(ErrorMessage = "ID Number is required")]
    [Display(Name = "ID Number:")]
    [RegularExpression(@"^(\d{13})$", ErrorMessage = "Enter a 13 digit ID number")]
    public Int64 ID_Number { get; set; }
     [Required(ErrorMessage = "The start date is required")]
    [Display(Name = "Start Date:")]
    [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MMM/yyyy}")]
    public DateTime Start_Date { get; set; }
    [Required(ErrorMessage = "The end date is required")]
    [Display(Name = …