I am moving my website from an old Windows 2000 machine toward a Windows 2008 R2 64bit machine. I encompass all right .NET versions, rebuild data sources. I have every web-apps working apart from 8 of 9 working. The .cs files exist in within the App Code folder of the website directory. In the existing production situation this application is working well. The compilers as well as browsers have no difficulty in finding class as of the call in default .cs class. If I try to open it in an independent case of IE and with a local host call, I obtain error: "CS0103. I acquire the similar error while trying to show it as of a remote machine with the http url. Can you tell me that what is the problem with that and how can this be resolved?