ASP.NET Core MVC Tutorial
Lesson 180/200

Tutorials ASP.NET Core MVC Tutorial

MediatR — Complete Guide

MediatR — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ASP.NET Core MVC Tutorial on Toolliyo Academy.

8 min read Updated 6/25/2026
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ASP.NET Core MVC Tutorial · Lesson 180 of 200

MediatR

Getting Started ✓ → Core MVC ✓ → Data & Security ✓ → Production ✓ → Career ✓

Interview Ready · 10 — Interview Prep · ~10 min · Section 21: Enterprise Development

What is this?

MediatR organizes code so controllers stay small and business rules stay testable.

Why should you care?

These patterns appear in enterprise .NET jobs and senior interviews.

See it live — copy this example

Create an MVC project (dotnet new mvc), add the code, and run dotnet run.

// MediatR — separate folders:
// ShopNest.Domain / Application / Infrastructure / ShopNest.Mvc

Run Example »

This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.

What happened?

  • Study the example line by line.
  • Each part connects to MediatR.
  • Edit one line, save, and run dotnet run to see what changes.

Try it yourself

  1. Sketch which layer owns this concern.
  2. Move one piece of logic out of the controller.
  3. Run a manual check to confirm behavior unchanged.
  4. Change text or labels in the example and run again — watch the browser update.
  5. Break the code on purpose (remove a semicolon), read the error message, then fix it.

Remember

You learned what MediatR is and when to use it. Practice by changing the example yourself. Explain it in your own words before moving on.

ASP.NET Core MVC Tutorial
Course syllabus
Section 1: Introduction & Environment Setup Overview of Microsoft Web Technologies — Complete Guide What is ASP.NET Core MVC? — Complete Guide Why MVC Was Created? — Complete Guide Evolution of ASP.NET — Complete Guide ASP.NET Framework vs ASP.NET Core — Complete Guide Web Application vs Website — Complete Guide MVC vs Razor Pages vs Blazor vs Minimal APIs — Complete Guide Installing Visual Studio 2022 — Complete Guide Installing .NET SDK — Complete Guide Installing Visual Studio Code — Complete Guide Installing SQL Server & SSMS — Complete Guide Installing Postman for API Testing — Complete Guide .NET Core vs Framework Execution Process — Complete Guide ASP.NET Core Environment Setup — Complete Guide Creating Your First MVC Project — Complete Guide
Section 2: ASP.NET Core Basics & Hosting Project Structure — Complete Guide ASP.NET Core Project File csproj — Complete Guide Program.cs and Main Entry Point — Complete Guide appsettings.json — Complete Guide launchSettings.json — Complete Guide Kestrel Web Server — Complete Guide InProcess Hosting — Complete Guide OutOfProcess Hosting — Complete Guide Middleware Pipeline — Complete Guide Request Processing Pipeline — Complete Guide wwwroot Folder — Complete Guide Static Files Middleware — Complete Guide Configuring Default Page — Complete Guide Developer Exception Page — Complete Guide ASP.NET Core CLI and Project Templates — Complete Guide
Section 3: Controllers What is a Controller? — Complete Guide Creating Controllers — Complete Guide Action Methods — Complete Guide AddController vs AddMvc vs AddControllersWithViews — Complete Guide Passing Data to Views — Complete Guide MVC Request Lifecycle — Complete Guide
Section 4: Views & Razor Razor View Engine — Complete Guide ViewData — Complete Guide ViewBag — Complete Guide TempData — Complete Guide Strongly Typed Views — Complete Guide ViewModel Pattern — Complete Guide Layout Pages — Complete Guide Sections in Layout View — Complete Guide ViewStart — Complete Guide ViewImports — Complete Guide Partial Views — Complete Guide Rendering Partial Views — Complete Guide View Components — Complete Guide Installing Bootstrap in MVC — Complete Guide
Section 5: Models & Data Passing Creating Models — Complete Guide Model Binding Overview — Complete Guide Model Validation — Complete Guide Data Annotations — Complete Guide Custom Validation Attributes — Complete Guide Post-Redirect-Get Pattern — Complete Guide Using Bootstrap in MVC Views — Complete Guide Real-World Applications of MVC — Complete Guide
Section 6: Routing Conventional Routing — Complete Guide Custom Routing — Complete Guide Route Constraints — Complete Guide Attribute Routing — Complete Guide Attribute Routing Tokens — Complete Guide Areas — Complete Guide
Section 7: Dependency Injection What is Dependency Injection? — Complete Guide Singleton vs Scoped vs Transient — Complete Guide Constructor Injection — Complete Guide Interface Injection — Complete Guide Options Pattern — Complete Guide
Section 8: Action Results IActionResult Overview — Complete Guide ViewResult — Complete Guide PartialViewResult — Complete Guide JsonResult — Complete Guide ContentResult — Complete Guide FileResult — Complete Guide Redirect Results — Complete Guide Status Results — Complete Guide ObjectResult — Complete Guide EmptyResult — Complete Guide
Section 9: HTML Helpers HTML Helpers Overview — Complete Guide TextBox HTML Helper — Complete Guide TextArea HTML Helper — Complete Guide DropDownList HTML Helper — Complete Guide RadioButton HTML Helper — Complete Guide CheckBox HTML Helper — Complete Guide ListBox HTML Helper — Complete Guide Editor and Password Helpers — Complete Guide Hidden HTML Helper — Complete Guide Custom HTML Helpers — Complete Guide Forms with HTML Helpers — Complete Guide Generating Links with HTML Helpers — Complete Guide
Section 10: Tag Helpers Tag Helpers Overview — Complete Guide Image Tag Helper — Complete Guide Environment Tag Helper — Complete Guide Navigation Menu Tag Helpers — Complete Guide Form Tag Helpers — Complete Guide Partial Tag Helper — Complete Guide Custom Tag Helper — Complete Guide View Component Tag Helper — Complete Guide Cache Tag Helper — Complete Guide HTML Helpers vs Tag Helpers — Complete Guide
Section 11: Model Binding Model Binding in MVC — Complete Guide Model Binding FromForm — Complete Guide Model Binding FromQuery — Complete Guide Model Binding FromRoute — Complete Guide Complex Type Model Binding — Complete Guide Custom Model Binding — Complete Guide
Section 12: Validation Model Validations in MVC — Complete Guide Data Annotation Attributes — Complete Guide Display and DisplayFormat Attributes — Complete Guide Remote Validation — Complete Guide BindNever and BindRequired — Complete Guide Blacklist and Whitelist Validation — Complete Guide Data Annotations Real-Time Examples — Complete Guide FluentValidation Introduction — Complete Guide FluentValidation Examples — Complete Guide FluentValidation Async Validators — Complete Guide FluentValidation Custom Validators — Complete Guide FluentValidation Real-Time Examples — Complete Guide Data Annotations vs FluentValidation — Complete Guide AntiForgery Token — Complete Guide
Section 13: State Management Cookies in ASP.NET Core MVC — Complete Guide Persistent vs Non-Persistent Cookies — Complete Guide Sessions in ASP.NET Core MVC — Complete Guide Cookies vs Sessions — Complete Guide
Section 14: Filters Filters in ASP.NET Core MVC — Complete Guide Exception Filters — Complete Guide Handling HTTP Status Codes — Complete Guide Custom Error Pages — Complete Guide Result Filters — Complete Guide Authorization Filters — Complete Guide Action Filters — Complete Guide TypeFilter vs ServiceFilter — Complete Guide
Section 15: Database & EF Core Entity Framework Core in MVC — Complete Guide DbContext in MVC — Complete Guide Connection Strings — Complete Guide EF Core Migrations — Complete Guide CRUD with EF Core — Complete Guide EF Core Relationships — Complete Guide Repository Pattern — Complete Guide Unit of Work Pattern — Complete Guide
Section 16: Authentication ASP.NET Core Identity — Complete Guide Cookie Authentication — Complete Guide JWT Authentication — Complete Guide Role Authorization — Complete Guide Policy Authorization — Complete Guide
Section 17: File Handling File Handling in MVC — Complete Guide Restricting File Type and Size — Complete Guide Export Data to Excel — Complete Guide Import Excel to Database — Complete Guide Generate PDF in MVC — Complete Guide Password Protected PDF — Complete Guide Upload Multiple Files — Complete Guide File Upload in MVC — Complete Guide
Section 18: Advanced MVC Logging — Complete Guide Exception Handling — Complete Guide Configuration — Complete Guide Response Caching — Complete Guide Localization — Complete Guide Sending Email — Complete Guide MVC with EF Core Database First — Complete Guide Cascading Dropdown List — Complete Guide Single Page CRUD — Complete Guide Razor Pages Application — Complete Guide Dynamic Menus — Complete Guide Real-Time Apps with SignalR — Complete Guide
Section 19: Performance Async in MVC — Complete Guide Response Compression — Complete Guide Output Caching — Complete Guide Bundling & Minification — Complete Guide Performance Best Practices — Complete Guide
Section 20: Deployment Deploy to IIS — Complete Guide SSL on Local IIS — Complete Guide Docker — Complete Guide Azure App Service — Complete Guide Linux Hosting with Nginx — Complete Guide
Section 21: Enterprise Development Clean Architecture — Complete Guide SOLID Principles in MVC — Complete Guide CQRS Pattern — Complete Guide MediatR — Complete Guide Repository Pattern Deep Dive — Complete Guide Structured Logging — Complete Guide Testing MVC Applications — Complete Guide ShopNest Enterprise Architecture — Complete Guide
Section 22: Real-World Projects Student Management System Project — Complete Guide Library Management System Project — Complete Guide Hospital Management System Project — Complete Guide Blog Management Application — Complete Guide Inventory Management Project — Complete Guide CRM Project — Complete Guide E-Commerce Project — Complete Guide Food Delivery App Project — Complete Guide HRMS Employee Portal Project — Complete Guide Gmail Style Registration Project — Complete Guide
Section 23: Interview Preparation MVC Interview Questions — Beginner — Complete Guide MVC Interview Questions — Intermediate — Complete Guide Scenario-Based Interview Questions — Complete Guide Architecture Interview Questions — Complete Guide Hands-on Coding Exercises — Complete Guide MVC Interview Preparation — Complete Guide — Capstone
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