Tutorials ADO.NET Core Tutorial
Delete Operations — Complete Guide
Delete Operations — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
On this page
ADO.NET Core Tutorial · Lesson 14 of 100
Delete Operations
Foundations → SQL & safety → Production → Projects
Foundations · 1 — Connections & CRUD · ~6 min · Module 2: CRUD Operations
What is this?
DELETE removes rows. Prefer soft-delete flags in commerce; hard delete for staging/temp data.
Why should you care?
ShopNest rarely hard-deletes orders — but cart lines and temp imports do.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
cmd.CommandText = "DELETE FROM CartItems WHERE CartId = @CartId AND Sku = @Sku";
cmd.Parameters.Add("@CartId", SqlDbType.UniqueIdentifier).Value = cartId;
cmd.Parameters.Add("@Sku", SqlDbType.NVarChar, 32).Value = "HD-100";
Console.WriteLine(await cmd.ExecuteNonQueryAsync(ct));What happened?
- Always parameterize keys.
- Soft-delete: UPDATE … SET IsDeleted=1 for business records.
Practice next
- Delete one cart line.
- Soft-delete pattern for Orders.
- FK errors → delete children first or cascade by design.
- Soft-delete with IsDeleted bit.
- Count before delete.
Remember
Parameterized deletes. Prefer soft-delete for money data. Mind FKs.
ShopNest cart line remove
User removes SKU from cart.
Outcome: Only that line disappears.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
