How scoped services behave in background tasks vs request scope

Short answer: Scoped services are tied to the HTTP request lifecycle. In background tasks, you must manually create a scope using IServiceScopeFactory to resolve scoped services safely.

Real-world example (ShopNest)

ShopNest registers AppDbContext as Scoped and IMemoryCache as Singleton. Putting DbContext in a Singleton causes threading bugs.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.