To Check if a file exist in Client Machine ASP.NET

Hi,

I was using a File Upload functionality in ASP.NET with good old <INPUT type=file ..>. If the users are using the Browse button shown next to the textbox and selecting the required file then there is no issue about the file getting upload.

But instead if they are directly typing the file name in the textbox instead of using the Browse button then I should be able to check if really the file exist in the client machine.

Please note that I am NOT trying to check if the file exist in ther Server, I want some function that would let me check in the local machine of the user whether the file exist or not.

if somebody as an idea it would be of great help to me.

Thanks