System 4.0.0.0 System.EventArgs To be added. Provides data for the event. Constructor 4.0.0.0 To be added. Initializes a new instance of the class. The name of the property that has an error. null or if the error is object-level. Property 4.0.0.0 System.String To be added. To be added. Gets the name of the property that has an error.