ReplaceInvalidChars

//Replaces the invalid file name chars with "@" char.
        public static void ReplaceInvalidChars(ref string fileName) {
            char[] invalidChars = System.IO.Path.GetInvalidFileNameChars();

            for(int index = 0;index < invalidChars.Length;index++) {
                fileName = fileName.Replace(invalidChars[index],'@');
            }
        }