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Why hashtables are not serialzable in .NET? View(s): 25321 Why can't I serialize hashtables Answer 1) The thing about XML Serialization is that it's not just about creating a stream of bytes. It's also about creating an XML Schema that this stream of bytes would validate against. There's no good way in XML Schema to represent a dictionary. This limitation is not only Hashtable, the XmlSerializer cannot process classes implementing the IDictionary interface due to the fact that a hashtable does not have a counterpart in the XSD type system. The only solution is to implement a custom hashtable that does not implement the IDictionary interface. Answered by Mr. Ponna   Asked in:  TCS (Tata Consultancy Services)   Expertise Level:  Experienced   Last updated on Saturday, 16 July 2011 3/5 stars (18 vote(s))