I have a development PC with two versions of Oracle installed i.e. 10g and 11g.I have a web application (ASP.NET with Visual Basic). When I deploy the web application to IIS7 (installed on my local PC), both versions work. However, when I attempt to use them in Visual Studio I receive an error: "TNS:could not resolve the connect identifier specified". I get a reply when I use MSDOS to TNSPING the data source.