Interview Q&A

Master technical and career interviews with structured answers—short definition, real examples, pitfalls, and how to answer in 60–90 seconds.

4608 total questions 4508 technical 100 career & HR 4272 from PDF library
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Mid PDF
How to update only selected properties of an entity (partial updates)?

Short answer: Attach entity, then set only modified properties as Modified. Use context.Entry(entity).Property(p => p.PropertyName).IsModified = true. Useful for PATCH operations. Real-world example (ShopNest) ShopNes…

EF Core Read answer
Mid PDF
How to do bulk insert / bulk update / bulk delete (outside EF Core’s out-of-box, maybe with third party)?

Short answer: Use libraries like EFCore.BulkExtensions, Z.EntityFramework.Extensions. These provide optimized bulk operations, bypassing EF change tracking for performance. Real-world example (ShopNest) ShopNest’s order…

EF Core Read answer
Junior PDF
What is lazy loading proxy?

Short answer: EF Core creates a dynamic proxy subclass of your entity at runtime. Proxy overrides virtual navigation properties to load related data on-demand. Requires navigation properties to be virtual and package Mic…

EF Core Read answer
Junior PDF
What is lazy loading proxy?

Short answer: How does the dynamic proxy work under the hood? EF Core creates a dynamic proxy subclass of your entity at runtime. Proxy overrides virtual navigation properties to load related data on-demand. Requires nav…

EF Core Read answer

Entity Framework Core Entity Framework Core Tutorial · EF Core

Short answer: Attach entity, then set only modified properties as Modified. Use context.Entry(entity).Property(p => p.PropertyName).IsModified = true. Useful for PATCH operations.

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.
Permalink & share

Entity Framework Core Entity Framework Core Tutorial · EF Core

Short answer: Use libraries like EFCore.BulkExtensions, Z.EntityFramework.Extensions. These provide optimized bulk operations, bypassing EF change tracking for performance.

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.
Permalink & share

Entity Framework Core Entity Framework Core Tutorial · EF Core

Short answer: EF Core creates a dynamic proxy subclass of your entity at runtime. Proxy overrides virtual navigation properties to load related data on-demand. Requires navigation properties to be virtual and package Microsoft.EntityFrameworkCore.Proxies. Proxy intercepts access and triggers loading when property is accessed.

Real-world example (ShopNest)

Loading orders with items uses .Include(o => o.Items). Without Include, listing 50 orders can trigger 50 extra queries (N+1).

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.
Permalink & share

Entity Framework Core Entity Framework Core Tutorial · EF Core

Short answer: How does the dynamic proxy work under the hood? EF Core creates a dynamic proxy subclass of your entity at runtime. Proxy overrides virtual navigation properties to load related data on-demand. Requires navigation properties to be virtual and package Microsoft.EntityFrameworkCore.Proxies. Proxy intercepts access and triggers loading when property is accessed.

Real-world example (ShopNest)

Loading orders with items uses .Include(o => o.Items). Without Include, listing 50 orders can trigger 50 extra queries (N+1).

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.
Permalink & share
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