Write access to folder in wwwroot/ IIS window 7

I am testing an ASP.NET website on local IIS (Windows 7)

I wanted the file uploaded by the user on the webpage to be saved on the server/folder where the application resides.

I granted read/write permissions to the folder containing the website files in inetpub/wwwroot

But while testing the application, after attaching file and click submit, the attached file disappears and nothing happens.

Add the required folder permissions for the NETWORK SERVICE account and see if that works for you?