The OnDisconnect event occurs when the client disconnects
from the server or when the server terminates the connection to the
client by calling the Disconnect method. It is not required for
the application to explicitly disconnect the client within the event
handler, and the application cannot prevent the client from
disconnecting from the server.
This event may not occur for a each client session when the server
is reset or the control instance is disposed without the application
first calling the Stop method to shutdown the server.