ASP.NET Core Interview Q&A
Agenda
• MVC Pattern Q&A
• ASP.NET Core Q&A
• Model and Views Q&A
• Controller and Actions Q&A
• View Engine and Razor Q&A
• Routing Q&A
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Q&A:
MVC Pattern
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Q1. What is MVC?
• MVC stands for Model-View-Controller.
• An architectural pattern which separates an
application into three main logical components:
model, view, and controller.
• Supports separation of concerns, since model
describe the data, view represent UI and controller
manage the presentation logic.
• Today, this pattern is used by many popular
frameworks like as ASP.NET MVC, ASP.NET Core,
Ruby on Rails, Spring Framework and Cake Php etc.
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Q2. How MVC pattern arrange an application?
Data
Object
Model
Logic
Class
Controller
UI
DOM
View
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Q3. How MVC Pattern Works?
Model
View
Controller
Eg. www.domain.com/Product/Edit/1
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Q3. How MVC Pattern Works?
Model
View
Eg. www.domain.com/Product/Edit/1
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Controller
Q3. How MVC Pattern Works?
Model
Changes
Presentation
Interaction
View
Notification
Notification
Presentation
Controller
Eg. www.domain.com/Product/Edit/1
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Interaction
Q4. What is the difference between Layer and Tier?
• Layer is logical separation of code.
• Tier is a physical separation of code. In fact, tier is a machine, where the
code/process runs.
DAL
DAL
(Class Library)
(WCF: Hosted App)
BAL
BAL
(Class Library)
(WebAPI: Hosted App)
PL
PL
(MVC5: Hosted App)
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(MVC5: Hosted App)
Q5. What is the Difference between MVC and 3-Tier?
DAL
Model
BAL
View
PL
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Controller
Q5. What is the Difference between MVC and 3-Tier?
Model
View
Controller
Presentation Tier
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Q6. What is the difference between Design Patterns and Architectural patterns?
• Design Patterns are applied at low-level i.e. code level.
• Design patterns example are GOF Design Patterns.
• Architectural Patterns are applied at highly-level i.e. component level.
• Architectural patterns example are MVC, MVP, SOA, 3-Tier etc.
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Q&A:
Introduction to ASP.NET Core
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Q1. What is ASP.NET Core?
• An open-source, cross-platform and unified
framework for building Web UI and Web
APIs.
• Runs on .NET Core or on the full .NET
Framework (till ASP.NET Core 2.2).
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Q2. What are ASP.NET Core Features?
• Cross-platform and Containers Support
• High performance
• Unified MVC & Web API frameworks
• Built-in dependency injection support
• New light-weight and modular HTTP request pipeline
• Ships entirely as NuGet packages
• Built-In support for SPA with client-side frameworks like Angular, React, Vue
• Serve 2300% more requests per second as compared to ASP.NET 4.6
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Q3. Explain ASP.NET Core Architecture?
.NET Framework 4.6+
.NET Core 2.2
Runtime
Components
Compilers
NuGet packages
Next gen JIT (RyuJIT)
SIMD
Languages innovation
.NET Compiler Platform
.NET Core Libraries
.NET Framework 4.6 Libraries
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ASP.NET Core 3.x/5.x Architecture
.NET Framework 4.6+
.NET Core 3.x/5.x
Runtime
Components
Compilers
NuGet packages
Next gen JIT (RyuJIT)
SIMD
Languages innovation
.NET Compiler Platform
.NET Core Libraries
.NET Framework 4.6 Libraries
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Q4. How ASP.NET Core Request Processing is different from ASP.NET?
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Q5. Compare ASP.NET MVC5 with ASP.NET Core?
• Html Helpers
• Tag Helpers and Html Helpers
• Follows WebForms & Razor Syntaxes
• Follows only Razor Syntax
• Partial Views: Static, Dynamic
• Partial Views & View Components
• Type: Web Application
• Type : Console Application
• Global.asax and Web.config
• startup.cs/program.cs and appsettings.json
• Modules and Handlers
• Middleware
• Hosted on IIS
• Cross-platform Kestrel web server
• Runs only with Windows
• Runs with Mac, Linux & Windows
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Q&A:
Model and Views
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Q1. What is Model?
Models are domain objects in our application which are used to represent
real world entities/objects.
Data Model
Business Model
Service Model
Presentation Model
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Q2. What is View?
• A view is used to define the UI for your web page. It also display the data
received from the controller as a result.
• Views are stored in the Views folder and mapped to the controller’s actions.
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Q3. What are different Types of Views?
Standard View
Strongly Typed View
Partial View
Layout
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Q&A:
Controller and Actions
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Q1. What is Controller?
• A controller is a class which is used to define
presentation logic.
• By default, controllers are stored in the Controllers
folder and have Controller as suffix.
• Responds to HTTP requests with the help of actions.
• Process the received input from user, prepare the
results and send back to user.
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Q2. What is an action method and a Regular Method?
• An action is a method which responds to user action/activity.
• Any method in a controller which has public access modifier acts as an
action method.
Action Methods
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Regular Methods
Q3. What are the different types of Action Results?
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Q&A:
View Engine and Razor
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Q1. What is View Engine?
• A View Engine is an ASP.NET Core MVC subsystem which is responsible for
converting the server-side template into HTML markup and rendering it to
the browser.
• Has its own markup syntax to define server-side template where, you can
mix C# and HTML together.
• ASP.NET Core supports only Razor View Engine.
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Q2. What is Razor?
• A markup syntax to create dynamic web pages.
• Introduced with ASP.NET MVC 3.
• Embed with .NET languages C# and VB.
• Easily integrate with HTML Markup.
@for(int i = 1; i <= 20; i++)
{
<p>Line @i</p>
}
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Q&A:
Routing
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Q1. What is Routing?
• A pattern matching system that monitor the incoming request and figure
out what to do with that request
• Typically, a way to serve user request
Request
Routing
Controller
Response
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View
Model
Q2. How Routing Works?
Route1
Url Pattern
Handler
Route2
Url Pattern
Hander
Route3
Url Pattern
Handler
Route Table
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Q3. What are the different types of Routing?
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Q4. How Convention based Routing works?
ASP.NET Core 1.x to 2.x
ASP.NET Core 3.x and above
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Q5. How to define Attribute Routing?
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Q6. What are route constraints?
• Route constraints are used to put some validation around the defined
route parameters.
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Q7. When to use Attribute Routing?
• Attribute routing is helpful to have more control over the Url generation
patterns. Specially to support certain URI patterns that are common in
RESTful APIs.
• For example, resources often contain child resources like Clients have
ordered, movies have actors, books have authors and so on. Route sample:
/clients/1/orders
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Q8. How Routing is different from URL Rewriting?
• URL rewriting map new URL to the old URL.
Original URL: www.domain.com/product.aspx?id=1&catid=2
URL Rewriting: www.domain.com/product/1/2
• Routing map a URL to a route and a route is logically mapped to
a physical file with the help of controller and action
• Routing never rewrite your old url to new one but it map to the
original route.
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Q9. What are Endpoint, Route and Segment?
• An endpoint is a URL of a resource which can be used to perform a specific
task or functionality.
• A route is a pattern which can be matched to a given endpoints
to redirect requests.
• A route segment is a piece of the URL, as delimited by slashes (/).
Route Eg: [controller]/[action]
Endpoint Eg: GET account/login
Segments Eg: account, login
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