Tutorials ADO.NET Core Tutorial
Pagination — Complete Guide
Pagination — 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 20 of 100
Pagination
Foundations → SQL & safety → Production → Projects
Foundations · 1 — Connections & CRUD · ~6 min · Module 2: CRUD Operations
What is this?
Pagination returns a page of rows with OFFSET/FETCH or keyset (seek) pagination.
Why should you care?
ShopNest mobile cannot download all orders at once.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
cmd.CommandText = @"
SELECT Id, Total FROM Orders
WHERE CustomerId=@CustomerId AND Id > @AfterId
ORDER BY Id
OFFSET 0 ROWS FETCH NEXT @Take ROWS ONLY";
// keyset: WHERE Id > @AfterId often better than deep OFFSET
cmd.Parameters.Add("@CustomerId", SqlDbType.Int).Value = 7;
cmd.Parameters.Add("@AfterId", SqlDbType.Int).Value = afterId;
cmd.Parameters.Add("@Take", SqlDbType.Int).Value = 20;What happened?
- Deep OFFSET gets slow on large tables.
- Keyset using last seen Id scales better.
Practice next
- Page with OFFSET.
- build keyset with AfterId.
- Cap Take ≤ 100.
- Compare OFFSET 100000 vs keyset.
- Include Total count carefully (expensive).
Remember
Page results. Prefer keyset at scale. Cap page size.
ShopNest order pages
App sends afterId cursor.
Outcome: Smooth scroll without deep offsets.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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