SERIALIZE A hashtable that contains only String Type
check this post out for clues!
Just as a note - a bit off topic - if your Hashtable only contains strings, and only will ever contain strings, you should consider using the .NET StringDictionary class, same usage as a normal Hashtable, but type safe, it'll save you having to cast results or calling ToString() all the time!!
at the top of your code to use it!