What are your most useful custom ASP.NET MVC 2.0 Validation Attributes

Question

What are the custom ASP.NET MVC model validation attributes that you use. It seems that there are a ton of possibilities (zip code, email address, date in the past, etc.) but I haven't found any good sources where these are shared. I'll start the list with the following:

ASP.NET MVC 3 Credit Card Validator

Answer 1

If you use the MVC Foolproof project on codeplex you will get a bunch of ready-to-use validators like

Operator Validators

[Is]
[EqualTo]
[NotEqualTo]
[GreaterThan]
[LessThan]
[GreaterThanOrEqualTo]
[LessThanOrEqualTo]

Required Validators

[RequiredIf]
[RequiredIfNot]
[RequiredIfTrue]
[RequiredIfFalse]
[RequiredIfEmpty]
[RequiredIfNotEmpty]
[RequiredIfRegExMatch]
[RequiredIfNotRegExMatch]