Ajax Uploader is an easy to use, hi-performance ASP.NET upload component which allows you to upload files to web server without refreshing the page.
It supports ASP.NET AJAX frameworks and works in ajax updatepanel.
Ajax Uploader allows you to upload large files to a server with the low server memory consumption. The look and feel of file upload controls can be customized to seamlessly blend into your website design.
Top features and Benefits
Hi-Performance with optimized memory usage
By streaming uploads directly to an output stream, rather than loading them into memory, Ajax Uploader achieves a level of scalability and performance impossible to reach with ASP.NET's built-in functionality.
Provides rich progress and status information during the upload
Ajax Uploader has a real time progress bar which keeps track of every file upload. It offers an accurate and detailed progress indicator to end-users. It also gives end-users the ability to cancel uploads in progress.

Powerful approaches to uploading files without refreshing the page
Ever wanted to upload files using AJAX like in GMAIL, without reloading the page? This Ajax version File Upload Control can also be placed in an UpdatePanel.
Upload multiple files at once
With Ajax Uploader, end-users can easily upload several files at once - just select the files and submit the form.