In traditional web service, can Hash table (IDictionary interface) can be serialized or de-serialized ?

No.

Traditional web service uses XmlSerializer class to serialize or de-serialize objects into/from xml.

Classes that implement the IDictionary interface, such as Hash table cannot be serialized or de-serialized.

By using WCF, DataContractSerializer can translate the HashTable into XML.



Thanks and Regards
Akiii