Releases the unmanaged resources used by the System.IO.TextReader and optionally releases the managed resources.
This method is called by the public Dispose method and the object.Finalize method. By default, this method specifies the disposing parameter as true. object.Finalize specifies the disposing parameter as false.
When the disposing parameter is true, this method releases all resources held by any managed objects that this System.IO.TextReader references. This method invokes the Dispose method of each referenced object.