Designing landing page using Code On Time

I need to create a Home page using custom code and visual studio.
But when I am creating a new page and try to code it according to requirement, all code get vanished when I do Refresh or Generate. Is it some kind of configuration that I am missing?
I am using Visual Studio 2019 free trial version, Is there any possibility that code I write using Trial version would not be processed or compatible to Code On Time?
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