Program.cs

: Use builder.Services to register all your required classes before calling builder.Build() .

For a complex application, "putting it together" often means organizing hundreds of lines of configuration into a maintainable "paper-like" document: Program.cs

If you are a student and need to "write a complete program on paper" for a Computer Science exam, follow these standard structural requirements: : Use builder

: Include a clear sequence of input (e.g., Console.ReadLine() ), processing (your logic or math), and output (e.g., Console.WriteLine() ). 2. Organizing a Large "Program.cs" File (Professional Code) Organizing a Large "Program

: Start with necessary using directives (e.g., using System; ).

: Wrap your code in a namespace and a class Program to ensure proper scope.

: For larger apps, extract logic into extension methods to keep the file clean. Group configurations by feature (e.g., Database, Identity, Swagger).