Tutorials ADO.NET Core Tutorial
Inventory Management System — Complete Guide
Inventory Management System — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ADO.NET Core Tutorial on Toolliyo Academy.
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ADO.NET Core Tutorial · Lesson 93 of 100
Inventory Management System
Foundations ✓ → SQL & safety ✓ → Production ✓ → Projects
Projects · 4 — Portfolio builds · ~10 min · Module 10: Real-World Enterprise Projects
What is this?
Inventory reserves stock with UPDLOCK/rowcount checks inside ADO.NET transactions.
Why should you care?
ShopNest cannot oversell SKUs on flash sales.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
cmd.CommandText = @"UPDATE Inventory WITH (UPDLOCK, ROWLOCK)
SET Qty=Qty-@Qty WHERE Sku=@Sku AND Qty>=@Qty";
var n = await cmd.ExecuteNonQueryAsync(ct);
if (n == 0) throw new InvalidOperationException("Insufficient stock");What happened?
- Lock row.
- Check rows-affected.
- Same tx as order insert.
Practice next
- Inventory table.
- Reserve in tx.
- Fail if n==0.
- Release reservation on cancel.
- Outbox stock event.
Remember
UPDLOCK reserve. Rows-affected. Same order tx.
ShopNest stock reserve
Flash sale cannot oversell.
Outcome: Qty never goes negative.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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