In any cases, duplicate code should be avoided, because code reuse, encapsulation and maintainability are not accomplished. If encapsulation/code reuse is made properly, then we know for sure that we won't revisit that working code (unless we need to extend it). Writing good code and following best practices avoid technical debt.

This article quickly explains how to send an email automatically and periodically using windows service, SMTP Server (for sending the emails), Event Logs and many more technologies or concepts.

Review Minification and Bundling of resources like CSS and Javascript and the tools that are available at the moment for doing it.