Tutorials ADO.NET Core Tutorial
DataTable — Complete Guide
DataTable — 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 10 of 100
DataTable
Foundations → SQL & safety → Production → Projects
Foundations · 1 — Connections & CRUD · ~6 min · Module 1: ADO.NET Fundamentals
What is this?
DataTable is one in-memory table — columns, rows, constraints — often inside a DataSet or alone.
Why should you care?
ShopNest bulk staging sometimes builds a DataTable for SqlBulkCopy.
See it live — copy this example
Use a .NET console or API project with SQL Server LocalDB. Run dotnet run after pasting.
var table = new DataTable();
table.Columns.Add("Sku", typeof(string));
table.Columns.Add("Qty", typeof(int));
table.Rows.Add("HD-100", 2);
table.Rows.Add("CASE", 1);
Console.WriteLine(table.Rows.Count);What happened?
- Define columns, add rows, pass to bulk copy or adapters.
- Still RAM-bound.
Practice next
- Build a 2-column table.
- Add three rows.
- Feed SqlBulkCopy in a later lesson.
- Add a Price decimal column.
- Delete a row by index.
Remember
In-memory rows. Good bulk staging. Mind memory.
ShopNest bulk staging
Import builds DataTable then bulk copies.
Outcome: Fast loads without row-by-row inserts.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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