What is cascade delete, and how can it be configured?

Short answer: Cascade delete ensures that related entities are deleted when the parent entity is deleted. Configure with Fluent API: modelBuilder.Entity<Blog>() .HasMany(b => b.Posts) .WithOne(p => p.Blog) .OnDelete(DeleteBehavior.Cascade); Delete behaviors: Cascade Restrict SetNull NoAction EF Core defaults to Cascade for required relationships.

Real-world example (ShopNest)

ShopNest’s order service uses EF Core to save an Order and its line items in one SaveChangesAsync() call inside a transaction.

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.