Bloom.Collection.BloomPack.BloomPackInstallDialog.DeleteExistingDirectory C# (CSharp) Method

        private static void DeleteExistingDirectory(string destinationFolder)
        {
            foreach (var dir in Directory.GetDirectories(destinationFolder))
            {
                DeleteExistingDirectory(dir);
            }

            //By Bloom convention, thumbnails that were created by hand are marked "read only" so that the
            //thumbnail generator never overwrites them. However now that we're trying to clear out this
            //folder, we need to remove that readonly flag so we can delete it.
            foreach (var f in Directory.GetFiles(destinationFolder))
            {
                var attributes = RobustFile.GetAttributes(f);
                if ((attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
                {
                    RobustFile.SetAttributes(f, attributes & ~FileAttributes.ReadOnly);
                }
            }
            SIL.IO.RobustIO.DeleteDirectory(destinationFolder, true);
        }