• Not Null Validator: Validates that a value is not null
• Range Vailidator (generic, supporting IComparable types): Validates that a value falls within a specified range. The range may be closed or open ended, and may be inclusive or exclusive.
• Relative DateTime Validator: Validates that a DateTime falls within a specified range, relative to now. The range may be closed or open ended, and may be inclusive or exclusive. For example, you could check if a date is between now and 100 years from now, or from 20 days ago to 4 days from now.
• String Length Validator: Validates that a string is of a certain length. May contain a minimum, a maximum or both.
• RegEx Validator: Validates that a string matches a specified regular expression. We'll also include support for "pre-canned" RegEx patterns for common things such as URLs, e-mail addresses, phone numbers etc.
• Contains Characters Validator: Validates that a string contains all of the characters in a specified string.
• Type Conversion Validator: Validates that a string can be converted to a specific type (using a specific culture). For example, this could check that "6.32" can be converted to a Double, or "2007-02-09" can be converted to a DateTime.
• Enum Conversion Validator: Validates that a string can be converted to a value in a specified enum type. For example, this could check that "Blue" could be converted to a value in the Color enum.
• Domain Validator (generic): Validates that a value is included in a specified set, such as {"John", "Paul", "George", "Ringo"} or {2, 3, 5, 7, 11}. If the set only contains one value, this validator can be used to check for equality.

Next, here are our planned "composition" validators:

• And Composite Validator: Indicates that all of a set of child validators must pass
• Or Composite Validator: Indicates that just one of a set of child validators must pass.

Finally, here are our planned "value access" validators, which can be used to specify validation rules on complex objects:

• Property: Applies a validator to a property of an object
• Field: Applies a validator to a field of an object
• Method: Applies a validator to the result of a method of an object (can only be used for methods with no parameters and a non-void result, such as ToString()).
• Object: Specifies that a nested object needs to be validated by a particular rule set.
• Collection: Specifies that a nested collection of objects needs to be validated by a particular rule set.

Did we miss anything important?