Bruce, I found the problem.
You use SQL SERVER DBMS via an ADO.Net connection. In my app I used OLE DB.
There are somedifferences betweenthese two connectors.
In general, ADO.NET works with MS-based databases such as Sql Server. On the other hand, OLE DB is a standard format supported by a large number of dbs, so you can connect to oracle, db2 etc. using Oledb. You can also use oledb to connect to Sql Server but the performance is lower.
Particularly on data type supportability, OLE DB provider was not recently updated to fully support new data types in Oracle 10g +…However, Microsoft’s ADO.NET provider for Oracle does a better job with Oracle data types. ( OLE DB VS ADO.NET)
Thanks a lot!!