Set Authenticated Users permission to IIS site using C# code

Question

I have hosted one web application into my ISS. Now I don't to want to open iis and  i would like to give Authenticated Users permission to my site using c# code. (I have created application using MVC 5 )

 

 

Currently it have Creator Owner permission. Please see bellow image for more info

 

 

 

I would like to set Authenticated Users permission to this as bellow

 

 

 

I have tried bellow code but it is not working fine

 

string publishPath = System.IO.Path.GetFullPath("publish");

string folder = Context.Parameters[publishPath]; 

SecurityIdentifier sid = new SecurityIdentifier(WellKnownSidType.AuthenticatedUserSid, null);

FileSystemAccessRule writerule = new FileSystemAccessRule(sid, FileSystemRights.Write, AccessControlType.Allow); 

DirectorySecurity fsecurity = Directory.GetAccessControl(folder);

fsecurity.AddAccessRule(writerule);

Directory.SetAccessControl(folder, fsecurity);