System 2.0.0.0 4.0.0.0 System.ComponentModel.CancelEventArgs To be added. Provides data for the event handler. Constructor 2.0.0.0 4.0.0.0 To be added. Initializes a new instance of the class. Specifies an argument for an asynchronous operation. Property 2.0.0.0 4.0.0.0 System.Object To be added. To be added. Gets a value that represents the argument of an asynchronous operation. Property 2.0.0.0 4.0.0.0 System.Object To be added. To be added. Gets or sets a value that represents the result of an asynchronous operation.