---
title: "What are the difference between asynchronous controller implementation b/w ASP.NET MVC 3 & ASP.NET MVC 4? Can you explain in detail?"  
description: "What are the difference between asynchronous controller implementation b/w ASP.NET MVC 3 & ASP.NET MVC 4? Can you explain in detail?"  
author: "Anonymous User"  
published: 2014-10-10  
updated: 2020-09-18  
canonical: https://www.mindstick.com/interview/2209/what-are-the-difference-between-asynchronous-controller-implementation-b-w-asp-dot-net-mvc-3-asp-dot-net-mvc-4-can-you-explain-in-detail  
category: "asp.net mvc"  
tags: ["asp.net", "asp.net mvc"]  
reading_time: 1 minute  

---

# What are the difference between asynchronous controller implementation b/w ASP.NET MVC 3 & ASP.NET MVC 4? Can you explain in detail?

There is major difference is on implementation mechanism between ASP.NET MVC 3 and ASP.NET MVC 4.

**In ASP.NET MVC 3,** to implement async controller or methods we need to derive controller from AsyncController rather than from normal plain Controller class. We need to create 2 action methods rather than one. First with suffix ’Async’ keyword & second with ‘Completed’ suffix.

**In ASP.NET MVC 4** you need not to declare 2 action method. One can serve the purpouse. MVC 4 using .Net Framework 4.5 support for asynchronous communication.

## Answers

### Answer by Anonymous User

There is major difference is on implementation mechanism between ASP.NET MVC 3 and ASP.NET MVC 4.

**In ASP.NET MVC 3,** to implement async controller or methods we need to derive controller from AsyncController rather than from normal plain Controller class. We need to create 2 action methods rather than one. First with suffix ’Async’ keyword & second with ‘Completed’ suffix.

**In ASP.NET MVC 4** you need not to declare 2 action method. One can serve the purpouse. MVC 4 using .Net Framework 4.5 support for asynchronous communication.


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