I got the problem. Thank you for your suggestion.
When I try to connect to Oracle10g via OraDirect 3.5 and its
connection.Open();
I got:
An unhandled exception of type 'System.InvalidOperationException' occurred in CoreLab.Oracle.dll
Additional information: Can not find Oracle home.
I did not find a suggestion in this forum. Because the oracle client (ORACLE_HOME is set in the register) is installed I do not know what is the problem.
Because I need connect the Spatial option of Oracle, direct connection is unusable for me.
I get the problem at Windows 2003 Server x64 a Visual Studio 2005 .NET.
Thank you for your suggestion.
Michal