Our application is a combination of classic asp and asp.net. Can we access the same application variable in the classic asp that is defined in asp.net.
No, if classic asp files are run separately from the asp.net web application, they will work in a different address space and will not use the application or session context.
No, I think that they will work in a different address space and will not use the application or session context. You can use this link to understand how to share session state between classic ASP and ASP.NET: https://msdn.microsoft.com/en-us/library/aa479313.aspx