Tutorials ASP.NET Core MVC Tutorial
Developer Exception Page — Complete Guide
Developer Exception Page — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ASP.NET Core MVC Tutorial on Toolliyo Academy.
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ASP.NET Core MVC Tutorial · Lesson 29 of 200
Developer Exception Page
Getting Started ✓ → Core MVC → Data & Security → Production → Career
Beginner · 3 — Controllers & Views · ~6 min · Section 2: ASP.NET Core Basics & Hosting
What is this?
Developer Exception Page explains how ASP.NET Core starts, hosts HTTP requests, and wires the middleware pipeline.
Why should you care?
Hosting and configuration bugs show up in every deployment — know Kestrel, Program.cs, and appsettings cold.
See it live — copy this example
Create an MVC project (dotnet new mvc), add the code, and run dotnet run.
// Developer Exception Page — ShopNest.Mvc example
public class HomeController : Controller
{
public IActionResult Index() => View();
}
Run Example »
Edit the code and click Run — like W3Schools Try it Yourself.
What happened?
- Study the example line by line.
- Each part connects to Developer Exception Page.
- Edit one line, save, and run dotnet run to see what changes.
Try it yourself
- Open Program.cs and appsettings.json in ShopNest.
- Trace one request through middleware order.
- Change a hosting or config value and observe the effect.
- Change text or labels in the example and run again — watch the browser update.
- Break the code on purpose (remove a semicolon), read the error message, then fix it.
Remember
You learned what Developer Exception Page is and when to use it. Practice by changing the example yourself. Explain it in your own words before moving on.