System.Data.OracleClient requires Oracle client software version 8.1.7 or greater.

If the following error occurs, while running ASP.NET web application in IIS 6.0,

Follow the bellow instructions

Step - 1 )  Un-install any sql client installed

Step- 2 )  Re-install it.

Reason: Sometimes the web server can not collect those drivers needed fot ASP.NET Framework (if installed after installing the Database client)