inserting records in the oracle table problem

[mmary]

hi to all,
i am inserting the record in the table using C#.Net. my query is like that

string query =insert into TESTTABLE1 values('mmmm',25,'[email protected]','9894899987', '8-apr-2007');

when i am using the same query in the command prompt , record was inserted without any error.But when i am inserting the same query using the c#.Net , record was inserted with wrong date('20-apr-08'). plz some body help me to solve the problem.

thank u.

with thanks and regards
mmary