How can I allow my website visitors to create text files in ASP.NET?

I have Microsoft IIS and I have written a simple ASP.NET application that should allow a user to create a file on my server. I have allowed the Internet User permission to write to my wwwroot folder, but the application still won’t work, it throws an exception saying that access to the path is denied. What else can I do to allow my visitors to create files? Thanks.

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