Drag and Drop multiple files and upload them-URGENT

Question

Hi all,

Please help me out again -

My requirement -

I have to drag and drop multiple files in asp.net C#.

Steps-
1. There is a panel on asp.net page.
2. User can select multiple files from his/her drive and drag and drop these files on this panel.
3. User clicks "Upload" button.
4. System uploads the files on button_click event.
-------
Eg - In gmail, we drag and drop file and just upload them, so they can be sent to other recepients.
-----------
I cannot use JQuery for this.
-----------
Thanks a ton to all in advance.