Releases the unmanaged resources used by the System.IO.TextWriter and optionally releases the managed resources.
This method is called by Dispose and object.Finalize. 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.TextWriter references. This method invokes the Dispose method of each referenced object.