Drag & drop in asp.net application

Hi,

I am developing this content management system which display content/files in a hierarchical order.

I would like to implement download from the webpage and upload to the webpage using drag and drop functionality (i.e. like when we move a file from one folder to another in a windows enviornment, we just click on it drag it to the destination and release the mice button.

It is implementable in a windows based application but I would like to know if the similar functionality can be implemented in web based application using VB as core language.

PLEASE HELP...

Regards,

Billy