ASP to ASPX Script Conversion

We are redesigning our website and we are currently using classic ASP scripts that use Microsoft Access database files. We just learned that .ASPX files don't seamlessly integrate with classic ASP scripts. We use a [login to view URL] script called classified listings manager and use them as .ASP includes and need to convert these to includes that will work for .ASPX files. We also have a membership database using SQL and added a secure "members only" section that we would like to further customize it so that members can post listings once they have logged in with certain categories we set up which the script does not do. We need the management interface to be as fully functional, use the database content to become includes we can apply styles to, import existing data and some customization.