System Namespace
EventArgs is the base class for for classes containing event data.
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This class contains no event data; it is used by events that do not pass state information to an event handler when an event is raised. If the event handler requires state information, the application must derive a class from this class to hold the data.
For example, the System.AssemblyLoadEventArgs class is used to hold the data for assembly load events, and contains a System.Reflection.Assembly that describes the loaded assembly.