For a complex application, "putting it together" often means organizing hundreds of lines of configuration into a maintainable "paper-like" document:
: Start with necessary using directives (e.g., using System; ). Program.cs
: Use builder.Services to register all your required classes before calling builder.Build() . For a complex application, "putting it together" often
: Wrap your code in a namespace and a class Program to ensure proper scope. For a complex application
: In modern .NET (6+), you can write logic directly in Program.cs without an explicit Main method, which is best for small microservices.
: For larger apps, extract logic into extension methods to keep the file clean. Group configurations by feature (e.g., Database, Identity, Swagger).