.net - C# - Retrieve list of all ReadOnly files under a directory in Windows -

i need list of readonly files under directory including files under sub-folders. there in .net framework make easier looping through files?

    var path = @"c:\";//some path     var readonlyfiles = new directoryinfo(path)         .enumeratefiles("*", searchoption.alldirectories)         .where(file => file.attributes.hasflag(fileattributes.readonly));