Sorry,
I can not speak English well.
Write down the problem, only the contents.
VERSRION :OraDirect .NET version 4.75 for .NET Framework 2.0
OS : WINDOWS XP/VISTA
TOOL : Visual Studio 2008
Oracle DataBase Version : 10.2.0.5
Connect method : Direct=True , Unicode=True
NLS_LANG : KOREAN_KOREA.KO16MSWIN949