I am developing an outlook add in programming using Visual Studio C#.net 2003. In my application my requirement is to connect to the Oracle database. In my development machine Oracle database is installed, so here its working fine, but I need to deploy my application to the machine where Oracle has not been installed, so I tried to deploy Oracle instant client to the client machine, but it is not working. It’s throwing error message like “Oracle client and networking components were not found. These components are supplied by Oracle corporation and are part of the Oracle Version 7.3.3 or later client software installation. Provider is unable to function until these components are installed” I tried with 10.2 and 11.2 of Oracle Instant client in client machine I also tried with setting up path to Oracle Instant Client folder using command prompt. For Oracle data base connection I am using OLEDB connection with System.Data.OracleClient dll I am unable to understand why it is not working anything else I need to deploy to client machine. Anybody please help me to solve this issue. Thanks in advance.