ExtendedValidation (nuget): Extended Validation extends MVC validation to support server side and client side validations of Greater Than, Less Than, Not Equal To, etc. for various data types including DateTime, string, int, long.  Ex: In your model define -  [Display(Name="Start Date")] public DateTime Startdate { get; set;  }  [GreaterThan("Startdate")] Display(Name = "End Date")] public DateTime Enddate { get; set; }  public int? int1 { get; set; } [NotEqualTo("int1", ErrorMessage="{0} cannot be equal to {1}")] public int? int2 { get; set; }  *** Don't forget to include ExtendedValidation.js to your view page available in your Scripts folder once you install the package. 
Keywords: Validation|Extended|MVC|Data|Annotation|Unobtrusive