System.ServiceModel 4.0.0.0 System.SystemException The is thrown when custom attribute usage results in the generation of an invalid service description. For example, if a type has multiple parts with the same name, or a method has multiple parameters with the same name. Represents a message contract that is not valid. Constructor 4.0.0.0 Creates a new object. Initializes a new instance of the class. Constructor 4.0.0.0 To be added. Creates a new object using the . Initializes a new instance of the class using the specified message. Constructor 4.0.0.0 Creates a new object from the stream on deserialization. Initializes a new instance of the class when deserializing from a stream into an object. The serialization information. The stream from which to deserialize. Constructor 4.0.0.0 To be added. To be added. Creates a new object from the and . Initializes a new instance of the class that uses the specified message and inner exception.