probably it has nothing to do with .NET, what data provider are you using? what version of Oracle? what version of Oracle client utilities? in Windows Explorer, try to give ASPNET account read access to your Oracle home directoryalso see
http://weblogs.asp.net/cstewart/archive/2003/09/13/27432.aspx
http://weblogs.asp.net/cstewart/archive/2003/09/13/27432.aspx
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