Divided the project into Section for own understanding.

• Models - Class structure which will be used
• Service - Actual Functionality
• Program.cs - Regsiter the Service to be used. Asp.net core dependency injection
• On the Actual Page - PageName.cshtml - Page Constructor - Call the Service

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-6.0

1. builder.Services.AddScoped();
2. builder.Services.AddScoped();

With this you can change the implemention of the method without doing changes on all the pages