Could not load file or assembly ‘Oracle.DataAccess’ or one of its dependencies. An attempt was made to load a program with an incorrect format

I have installed a Web app on IIS 7.0 Windows Server 2008 R2 64bit.
I am referring an oracle.DataAccess.dll;
When I try to access the application I get the following message:
“Could not load file or assembly ‘Oracle.DataAccess’ or one of its dependencies. An attempt was made to load a program with an incorrect format.”
Can anybody help me, please?

IIS ASP.Net Website – ManagedPipelineHandler Error ( An operation was attempted on a nonexistent network connection)

I am experiencing a strange issue. I have an ASP.Net web application that uses Forms Authentication. If I open the log-in page and there is a couple of minutes of inactivity, the log-in attempt times out or IE / FireFox display “Cannot display this page”. If there is no pause or lack of activity, there is no issue and the website run as expected.