I am a newbie in C# programming and web development. Kindly let me know how I can find the code files for the login and register page in ASP.NET MVC.

I created this simple web app using this crash course;

Select pages you want to create, Here you can choose Login and Register page, Then To use your existing data context, select at least one file to override. You must select at least one file to add your data context.

After you finish these steps and generate page successfully, You will find these pages in Area/Identity/Pages/Account/... ,Then you can edit them.

More information you can refer to this Docs.