Defines a validation rule that demands that a property have a value.
Specifies informational text to be added to the exception message, when the current rule is broken.
Specifies whether the current rule should be inverted, to be checked.
Specifies a name of the rule created using the current attribute.
Specifies the application behavior when the rule is broken.
Specifies whether the current rule is checked for the properties that are set to null (Nothing in VB), an empty string (for string type propeties) or a minimal date (for DateTime type properties).
Specifies a context for checking the current Rule.
Specifies a criterion that must be satisfied by the validated object or property to check rules.
Specifies the target collection's element property that must be checked by the current rule.