Curriculum
Creating Your First ASP.NET Core Application is one of the most exciting milestones in learning ASP.NET Core development. After understanding ASP.NET Core Architecture, Middleware, HTTP Requests, and Request Processing, the next step is to build a working ASP.NET Core application. Creating Your First ASP.NET Core Application helps developers understand project structure, application startup, routing, controllers, views, and application execution.
Every professional ASP.NET Core developer must know how to create, run, test, and deploy a basic ASP.NET Core application before moving to advanced concepts such as MVC, Web APIs, Authentication, and Microservices.
Building a practical application helps developers understand:
Project Structure
Application Startup
Routing
Controllers
Views
Request Processing
Development WorkflowHands-on experience is the best way to learn ASP.NET Core.
Before creating an ASP.NET Core application, install:
.NET SDK
Visual Studio
Visual Studio Code
SQL Server (Optional)These tools are required for development.
SDK stands for:
Software Development KitThe .NET SDK contains:
Compiler
Runtime
Libraries
Templates
CLI ToolsIt enables developers to create and run .NET applications.
Open Command Prompt:
dotnet --versionExample Output:
9.0.100This confirms that the SDK is installed successfully.
Using Command Line:
dotnet new webapp
-n StudentPortalOutput:
Project Created SuccessfullyA new ASP.NET Core application is generated.
Steps:
Open Visual Studio
Create New Project
Select ASP.NET Core Web App
Enter Project Name
Choose .NET Version
Create ProjectVisual Studio generates the project automatically.
Typical Structure:
Controllers
Models
Views
wwwroot
appsettings.json
Program.cs
PropertiesEach folder has a specific responsibility.
Purpose:
Handle Requests
Execute Business Logic
Return ResponsesControllers process incoming requests.
Purpose:
Represent Data
Business Entities
Validation RulesModels define application data structures.
Purpose:
Display User Interface
Render HTML
Show DataViews are responsible for presentation.
Purpose:
CSS Files
JavaScript Files
Images
Static ContentPublic files are stored inside wwwroot.
Purpose:
Configuration Settings
Connection Strings
Application SettingsExample:
{
"Logging": {
"LogLevel": {
"Default": "Information"
}
}
}Configuration is stored centrally.
Program.cs is the entry point of the application.
Example:
var builder =
WebApplication.CreateBuilder(args);
var app =
builder.Build();
app.Run();Every ASP.NET Core application starts here.
Command:
dotnet runOutput:
Application StartedThe web server begins listening for requests.
Browser URL:
https://localhost:5001The default application page appears.
Example:
var builder =
WebApplication
.CreateBuilder(args);Responsibilities:
Configure Services
Load Configuration
Setup EnvironmentBuilder prepares the application.
Example:
var app =
builder.Build();Purpose:
Create Application
Configure Middleware
Handle RequestsThe application becomes executable.
Example:
app.MapGet(
"/",
() =>
"Welcome to ASP.NET Core");Output:
Welcome to ASP.NET CoreThis creates a simple endpoint.
An Endpoint is a destination that handles requests.
Examples:
/students
/courses
/teachersEndpoints return responses to clients.
Example:
app.MapGet(
"/students",
() =>
"Student List");
app.MapGet(
"/courses",
() =>
"Course List");Outputs:
Student List
Course ListMultiple routes can exist within the same application.
Example:
app.MapGet(
"/students/{id}",
(int id) =>
$"Student {id}");Request:
/students/5Output:
Student 5Parameters allow dynamic routing.
Example:
app.MapGet(
"/student",
() =>
new
{
Id = 1,
Name = "Rahul",
Course = ".NET"
});Output:
{
"id": 1,
"name": "Rahul",
"course": ".NET"
}JSON responses are common in APIs.
Example:
using
Microsoft.AspNetCore.Mvc;
public class
StudentController :
Controller
{
}Controllers organize application logic.
Example:
public IActionResult
Index()
{
return Content(
"Student Controller");
}Output:
Student ControllerAction methods handle requests.
Example:
app.MapControllerRoute(
name: "default",
pattern:
"{controller=Home}/{action=Index}/{id?}");Routing connects URLs to controllers.
File:
Views
↓
Student
↓
Index.cshtmlContent:
<h1>
Student Portal
</h1>Output:
Student PortalViews generate HTML content.
ASP.NET Core supports environments:
Development
Testing
Staging
ProductionEach environment can have different settings.
Typical workflow:
Create Project
↓
Write Code
↓
Run Application
↓
Test Features
↓
Fix Errors
↓
Deploy ApplicationThis cycle repeats throughout development.
Student Management Application:
Home Page
Student List
Course List
Attendance Module
Result ModuleAll modules are built using ASP.NET Core concepts.
Runs on Windows, Linux, and macOS.
Supports enterprise workloads.
Deployable to Azure and other cloud platforms.
Supports millions of users.
Includes modern security features.
These advantages make ASP.NET Core a preferred web framework.
Makes development difficult.
Use appsettings.json instead.
Can cause navigation issues.
Violates clean architecture principles.
Reduces maintainability.
Program.cs is the entry point of an ASP.NET Core application.
An Endpoint is a destination that processes requests and returns responses.
A Controller handles incoming requests and returns responses.
A View generates user interface content.
appsettings.json stores application configuration settings.
It provides practical experience with project structure, routing, controllers, and request handling.
An ASP.NET Core Application is a web application built using Microsoft’s ASP.NET Core framework.
Program.cs is the startup file and entry point of an ASP.NET Core application.
A Controller handles incoming requests and returns responses.
A View is responsible for displaying content to users.
appsettings.json stores configuration and application settings.
It helps developers understand project structure, routing, controllers, views, and application execution.