how to give full control to any directory in C# WinForm

hi

i have this code in C# for giving full control to any file, its work excellent

but how i can give full control to any Directory ?

string fileName = @"d:\MyFile.mdb";
FileSecurity fSecurity = File.GetAccessControl(fileName);
fSecurity.AddAccessRule(newFileSystemAccessRule("Everyone",FileSystemRights.FullControl,AccessControlType.Allow));
File.SetAccessControl(fileName, fSecurity);

thanks in advance