public void UploadAsync(string path, string ftpPath, bool overwrite)
{
using (WebClient webClient = webClientHelper.Create())
{
webClient.UploadProgressChanged += new UploadProgressChangedEventHandler(UploadProgressChanged);
webClient.UploadFileCompleted += new UploadFileCompletedEventHandler(UploadFileCompleted);
webClient.UploadFileAsync(new Uri(ftpPath), path);
}
}