My app have two scenario. one type is base on sql server database,the other
is on oracle. In code, i used typed dataset to fill load data from DB.but i
met a problem,that the type of timestamp is differen between sql server and
oracle. so i can't define the type of timestamp cloumn in dataset. What can i
do? I don't want to use two class to do the same job.

How about defining the DataTable column as a SQL_VARIANT
ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/tsqlref9/html/01229779-8bc1-4c7d-890a-8246d4899250.htm
It's designed to morph to any datatype...

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