File Upload with Progress bar for asp.net - Without flash

I'm looking开发者_Go百科 for a technique in order to upload files and show the progress. Both componentart and componentone use an ajax calls to a file with axd extension. I want to build my server control to works like these. ( I don't want to use these components )

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There is a nice free javascript library you can use to do it here: http://valums.com/ajax-upload/.

Right now, they only have examples of how to implement this in Perl, PHP, and Java, but I'm sure you could get the idea and implement it in C# or VB (whatever you're using).