func init
	// add using namespaces
	sys.add_use('System.Net')
	sys.add_use('System.ComponentModel')

	// initialize instance
	this.wc = sys.get_undef_manager("WebClient")

	// initialize events
	sys.event_add('onProgress', 'DownloadProgressChangedEventHandler', '', 'DownloadProgressChanged', this.wc)
	sys.event_imp('onProgress', '', '', '', 'Object sender, DownloadProgressChangedEventArgs args')
	if(linked('onDownload'))
		a = block.reggen()
		a.inc().inc().println('if(args.Cancelled && args.Error != null) return;')
		sys.event_add('onDownload', 'DownloadDataCompletedEventHandler', '', 'DownloadDataCompleted', this.wc)
		sys.event_imp('onDownload', '', '', '', 'Object sender, DownloadDataCompletedEventArgs args', a)
		block.delete(a)
	end
end

func doDownload(uri)
	blk.println(this.wc, '.DownloadDataAsync(new Uri(', d("URI"), '));')
end

func doCancel()
	blk.println(this.wc, '.CancelAsync();')
end