How we can add write access to a directory programmatically in C#?

Question

I have an ASP.NET page that creates directories, and in another page I upload some files in these folders, but when I upload a file in a directory, the below error appears:<

Answer 1

if you are using iis6 you need to grant the aspnet user permissions to that folder. if you are using iis7 you need to grant the IIS_IUSRS user permissions to that folder.