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', 'UploadProgressChangedEventHandler', '', 'UploadProgressChanged', this.wc)
	sys.event_imp('onProgress', '', '', '', 'Object sender, UploadProgressChangedEventArgs args')
	if(linked('onUpload'))
		a = block.reggen()
		a.inc().inc().println('if(args.Cancelled && args.Error != null) return;')
		sys.event_add('onUpload', 'UploadValuesCompletedEventHandler', '', 'UploadValuesCompleted', this.wc)
		sys.event_imp('onUpload', '', '', '', 'Object sender, UploadValuesCompletedEventArgs args', a)
		block.delete(a)
	end
end

func doUpload(uri, data)
	blk.println(this.wc, '.UploadValuesAsync(new Uri(', d("URI"), '), ', d("Data"), ');')
end

func doUpload2(uri, method, data)
	addr = d("URI")
	dt = d("Data")
	meth = d("Method")
	blk.println(this.wc, '.UploadValuesAsync(new Uri(', addr, '), ', meth, ', ', dt, ');')
end

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