System.ComponentModel.DataAnnotations 4.0.0.0 System.Attribute System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Property | System.AttributeTargets.Field | System.AttributeTargets.All, AllowMultiple=false) To be added. Denotes that a property or class should be excluded from database mapping. Constructor 4.0.0.0 To be added. Initializes a new instance of the class.