This policy is used to created a policy that determines whether or not a property value is required. For example, if a required policy is sent, then a property without a value will be considered a policy violation.
Syntax
public class RequiresValueConstraint : PropertyConstraint
Public Class RequiresValueConstraint Inherits PropertyConstraint
Gets the restriction message of this constraint. If Resolve returns a value of PropertyConstraint.ResolveResult.Failed, then the RestrictionMessage will contain a string which describes the failure.
