The following are some of the main features of Upload for ASP.NET Web Forms that you may find useful:

• Multi-file Upload
  Upload multiple files at once, and set restrictions on how many files can be uploaded at once.
• Upload Large Files
  You can upload files with a combined size of up to 2GB.
• Automatic File Storing
  Files are first uploaded to TempFolder and will be moved to the TargetFolder if they met the required conditions. For example, valid file extensions, the allowed MIME type, the allowed maximum file size, or custom validating logic.
• Upload Progress Bar
  Upload for ASP.NET Web Forms provides a light-weight progress bar, but you can easily provide your own progress UI by reading the client-side upload progress, which provides rich information for current uploading states.
• Flexible Upload Triggers
  Upload for ASP.NET Web Forms provides flexible trigger options that allow you to control when to submit the files to server.
• Reduces Server Load
  Upload for ASP.NET Web Forms uses HttpHandler to read the file data package transmitted from client to server. File data is saved based on chucks, which do not occupy much server memory.
• Theming
  With just a click of the SmartTag, change the button's look by selecting one of the 6 premium themes (Arctic, Midnight, Aristo, Rocket, Cobalt, and Sterling). Optionally, use ThemeRoller from jQuery UI to create a customized theme!
• CSS Support
  Use a cascading style sheet (CSS) style to define custom skins. CSS support allows you to match the upload control to your organization's standards.