Tutorials Entity Framework Core Tutorial
Create Operations in EF Core
Create Operations in EF Core: free step-by-step lesson with examples, common mistakes, and interview tips — part of Entity Framework Core Tutorial on Toolliyo Academy.
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Entity Framework Core Tutorial · Lesson 21 of 100
Create Operations in EF Core
Beginner ✓ → Intermediate → Advanced → Professional
Intermediate · 2 — Data & queries · ~6 min · Module 3: CRUD Operations
What is this?
Create operations insert new rows using Add or AddAsync on DbSet, optionally building object graphs, then SaveChangesAsync commits to SQL Server.
Why should you care?
New ShopNest listings, customer signups, and orders all begin with Add on the correct DbSet.
See it live — copy this example
Paste into a .NET project with EF Core packages, then run with LocalDB/SQL Server (dotnet ef / dotnet run).
var product = new Product
{
Name = "Mechanical Keyboard",
Sku = "SN-KBD-99",
Price = 5499,
CategoryId = 1
};
await _context.Products.AddAsync(product);
await _context.SaveChangesAsync();
Console.WriteLine(product.Id); // identity filled after saveWhat happened?
- AddAsync marks product Added.
- SaveChangesAsync executes INSERT and SQL Server identity returns Id into the object.
Practice next
- Insert one product and log Id after save.
- Insert Order with nested OrderItems — one SaveChangesAsync.
- Validate required fields before Add for friendly API 400 responses.
- Use AddRangeAsync with three products and single SaveChangesAsync.
- Attach a child OrderItem to new Order before Add — EF inserts both.
Remember
AddAsync stages inserts. SaveChangesAsync commits and fills identity Ids. Graph inserts handle parent-child in one transaction.
ShopNest seller onboarding
Marketplace API AddAsync new Product then returns 201 with generated Id for image upload pipeline.
Outcome: Identity Id becomes canonical catalog key across microservices.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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