ASP.NET MVC vs ASP.NET Core MVC

Introduction

Many developers get confused because both frameworks follow the MVC (Model-View-Controller) pattern and their controller and view code looks similar. However, internally they are very different.

Let’s understand the differences in detail.

1️⃣ Platform Support

ASP.NET MVC

Built on .NET Framework
Works only on Windows
Requires IIS (Internet Information Services)
Cannot run natively on Linux or macOS

ASP.NET Core MVC

Built on modern .NET (Core/5/6/7/8)
Cross-platform
Runs on Windows, Linux, and macOS
Can run inside Docker containers

2️⃣ Performance

ASP.NET MVC

Uses System.Web
Heavy request pipeline
Slower compared to ASP.NET Core

ASP.NET Core MVC

Lightweight architecture
No System.Web dependency
Faster request processing
High performance for APIs and microservices

3️⃣ Project Structure Difference

ASP.NET MVC Structure

web.config
Global.asax
App_Start folder
System.Web dependency

ASP.NET Core MVC Structure

appsettings.json
Program.cs
Startup logic (inside Program.cs in .NET 6+)
No Global.asax
Built-in dependency injection

ASP.NET Core MVC projects look cleaner and more modern.

4️⃣ Configuration System

ASP.NET MVC

Configuration is stored in:

web.config

XML-based configuration.

ASP.NET Core MVC

Configuration is stored in:

appsettings.json

JSON-based configuration (easier to read and manage).

5️⃣ Middleware vs HTTP Modules

ASP.NET MVC

Uses:

HTTP Modules
HTTP Handlers

The pipeline is more complex.

ASP.NET Core MVC

Uses:

Middleware

Example:

app.UseAuthentication();
app.UseAuthorization();

Middleware is simpler and more powerful.

6️⃣ Simple Code Comparison

ASP.NET MVC Controller

public ActionResult Index()
{
    ViewBag.Message = "Hello from MVC";
    return View();
}

ASP.NET Core MVC Controller

public IActionResult Index()
{
    ViewData["Message"] = "Hello from Core MVC";
    return View();
}

Code may look similar, but the underlying architecture is completely different.