You can create application objects in Global.asax file and access those variables throughout the application.
Application object remain in memory until the web server shut down or the web.config site configuration has changed.
I have created this blog to help those who are looking for a change in .Net. You can share your interview experience, problems and knowledge. Just mail your content at firstname.lastname@example.org. It will immediately published. Visit the blog for .Net FAQ,.Net interview questions,ASP .Net FAQ, C# .Net FAQ,ASP .Net interview questions, interview question on .Net, interview questions on C#.Before going to interview just go through the site.