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Learn Blazor - 10 Code Examples & CST Typing Practice Test

Blazor is a Microsoft framework for building interactive web applications using C# and .NET, running client-side via WebAssembly or server-side via SignalR.

View all 10 Blazor code examples →
Blazor Counter ExampleBlazor Todo List ExampleBlazor Toggle VisibilityBlazor Simple FormBlazor List RenderingBlazor Counter with StepBlazor Conditional RenderingBlazor Two-Way Binding ExampleBlazor Counter with AsyncBlazor Component Parameter Example

Learn BLAZOR with Real Code Examples

Updated Nov 25, 2025

Explain

Blazor allows developers to write web UIs in C# instead of JavaScript.

It supports two hosting models: Blazor WebAssembly (client-side) and Blazor Server (server-side).

Provides component-based architecture for reusable UI elements.

Integrates seamlessly with ASP.NET Core backend services.

Widely used for enterprise web apps, dashboards, and full-stack .NET applications.

Core Features

Razor syntax for UI components

Dependency Injection (DI) support

Event handling in C#

JavaScript interop when needed

State management via cascading values and parameters

Basic Concepts Overview

Razor components are reusable UI blocks

Data binding supports one-way and two-way flows

Dependency Injection enables service injection

Routing maps URLs to components

Event handling uses standard C# methods

Project Structure

Pages/ - routed UI components

Shared/ - reusable components

wwwroot/ - static files (JS, CSS)

Program.cs - app startup and DI configuration

App.razor - routing and root component

Building Workflow

Create a new Blazor project

Develop Razor components for UI

Inject services for business logic

Bind data and handle events

Deploy app as WebAssembly or Server app

Difficulty Use Cases

Beginner: build simple forms and data display

Intermediate: implement CRUD with APIs

Advanced: complex state management and nested components

Expert: full enterprise dashboard with authentication

Architect: integrate WebAssembly, server-side, and APIs

Comparisons

Blazor vs React: C# vs JavaScript, full-stack vs frontend-only

Blazor vs Angular: .NET integration vs TypeScript ecosystem

Blazor vs Vue: component-based similarity, different languages

Blazor WebAssembly vs Server: client-side vs server-side execution

Blazor vs Razor Pages: SPA interactivity vs traditional page model

Versioning Timeline

2018 - Blazor first announced by Microsoft

2019 - Blazor WebAssembly experimental release

2020 - Blazor WebAssembly official release with .NET 5

2021-2022 - .NET 6 and 7 improvements, server-side updates

2023-2025 - Blazor maturation, component libraries, and tooling enhancements

Glossary

Razor: templating syntax for components

Component: reusable UI block

WebAssembly: client-side runtime for .NET

Dependency Injection: service injection system

Interop: integration with JavaScript

Installation Setup

Install .NET SDK

Install Visual Studio or VS Code

Create a new Blazor project via CLI or IDE

Run `dotnet restore` to install dependencies

Test the app with `dotnet run`

Environment Setup

Install .NET SDK

Install Visual Studio or VS Code

Install browser for WebAssembly testing

Configure project via CLI or IDE

Test default template with `dotnet run`

Config Files

Program.cs - app startup and DI

App.razor - root component and routing

wwwroot/ - static assets

Pages/ - routed components

Shared/ - reusable UI components

Cli Commands

dotnet new blazorserver

dotnet new blazorwasm

dotnet build

dotnet run

dotnet publish

Internationalization

Resource files for localization

Culture-aware date/number formatting

Supports multiple languages

Integration with .NET globalization APIs

Dynamic content translation in components

Accessibility

Supports ARIA roles and labels

Keyboard navigation

Screen reader compatibility

Contrast and focus management

Accessible forms and validation

Ui Styling

CSS and SCSS support

Component-scoped CSS

Integration with libraries like Bootstrap, MudBlazor

Dynamic styling with C# logic

Reusable UI component styling

State Management

Component-level state

Cascading values for shared state

Singleton services via DI

Session and local storage for persistence

Observable patterns with events or StateHasChanged

Data Management

API calls via HttpClient

JSON serialization/deserialization

Database integration with EF Core

In-memory caching via services

Client-side storage for WebAssembly apps

Architecture

Components -> Razor + C# code

Pages -> components mapped to routes

Services -> DI for shared logic

State -> cascading values, singleton services

Interop -> optional JavaScript integration

Rendering Model

Blazor Server -> UI events sent over SignalR

Blazor WebAssembly -> C# runs in browser

Components render HTML via Razor templates

Event handling mapped to C# methods

State changes trigger re-rendering of affected components

Architectural Patterns

Component hierarchy and nesting

Dependency Injection for shared services

State management with cascading values

Routing via @page directive

Optional JavaScript interop for advanced features

Real World Architectures

Enterprise dashboards with authentication and APIs

E-commerce web apps with reusable components

Client portals integrating multiple services

Data visualization apps with charts and grids

Full-stack .NET applications sharing code client/server

Design Principles

Component-based UI design

Full-stack C# development

Seamless .NET integration

Flexible hosting (WebAssembly or Server)

Strong tooling support via Visual Studio and CLI

Scalability Guide

Use Blazor Server with SignalR for large-scale apps carefully

Cache static content and APIs

Split WebAssembly app into lazy-loaded components

Use efficient state management

Deploy via scalable cloud hosting (Azure, AWS)

Migration Guide

Migrate Razor Pages or MVC apps to Blazor components

Refactor JS logic to C# if possible

Integrate APIs via HttpClient

Update routing and navigation

Test both WebAssembly and Server hosting models

Performance Notes

WebAssembly apps have higher initial load but run efficiently after load

Server apps depend on SignalR latency

Static content can be cached to improve load times

Efficient state management prevents unnecessary UI re-renders

Use virtualization for large lists or tables

Security Notes

Use ASP.NET Core Identity for authentication

Validate inputs on both client and server

Protect APIs with proper authorization

Avoid storing sensitive info in client-side code

Ensure HTTPS and secure headers are enabled

Monitoring Analytics

Track API call performance

Log errors in server-side apps

Monitor user interactions

Measure WebAssembly load times

Use Application Insights or other telemetry

Code Quality

Follow component encapsulation

Use DI for services

Unit-test components and services

Keep Razor and C# logic clean and maintainable

Follow .NET naming and coding conventions

Practical Examples

Build a counter component

Fetch data from an ASP.NET Core API

Implement login and authentication

Create a reusable navigation menu

Develop a dashboard with charts and tables

Troubleshooting

Check component namespaces and file names

Ensure services are registered in DI container

Verify routing paths in App.razor

Inspect browser console for WebAssembly errors

Use debugger in Visual Studio for server-side apps

Testing Guide

Unit-test components with bUnit

Integration tests with TestServer

End-to-end tests with Playwright or Selenium

Test API calls separately

Validate routing and navigation logic

Deployment Options

Static WebAssembly hosting (Azure Static Web Apps, Netlify)

Server-side Blazor on IIS/Kestrel

Docker containers for scalable deployment

Cloud hosting with Azure App Service

Hybrid hosting with CDNs for static assets

Tools Ecosystem

Visual Studio & VS Code

.NET CLI

NuGet packages for libraries

Blazor component libraries (Radzen, MudBlazor, Syncfusion)

Browser developer tools for debugging

Integrations

ASP.NET Core APIs

Entity Framework Core for database access

Authentication services (IdentityServer, Azure AD)

Third-party JS libraries via JS interop

Cloud hosting (Azure, AWS, Docker)

Productivity Tips

Reuse components across pages

Leverage DI for shared services

Use async/await for API calls

Lazy-load large modules in WebAssembly

Debug in Visual Studio for server-side apps

Challenges

Learning Razor syntax for complex UIs

Managing component state efficiently

Optimizing WebAssembly load times

Integrating third-party JS libraries

Deploying server-side apps at scale

Learning Path

Learn C# and .NET basics

Understand Razor syntax and components

Learn Blazor WebAssembly vs Server

Work with dependency injection and services

Practice building real-world applications

Skill Improvement Plan

Week 1: Create simple components and data binding

Week 2: Implement routing and forms

Week 3: Fetch data from APIs

Week 4: Add authentication and authorization

Week 5: Build full SPA with shared components

Interview Questions

What is Blazor and its hosting models?

Explain component-based architecture in Blazor.

How does Blazor WebAssembly differ from Blazor Server?

How do you perform data binding in Blazor?

How do you integrate a Blazor app with APIs?

Cheat Sheet

@page - define routing for component

@inject - inject a service

@bind - two-way data binding

Event handlers - e.g., @onclick

CascadingValue - share state across components

Books

Blazor in Action

ASP.NET Core Blazor for Enterprise

Blazor WebAssembly by Example

Full-Stack Development with Blazor

Building Modern Web Apps with Blazor

Tutorials

Create a counter component

Fetch data from ASP.NET Core API

Implement forms with validation

Add authentication and authorization

Build a dashboard with charts

Official Docs

https://docs.microsoft.com/en-us/aspnet/core/blazor/

https://github.com/dotnet/aspnetcore

Community Links

Blazor GitHub Discussions

Microsoft Learn Blazor forum

StackOverflow Blazor questions

Reddit r/Blazor

YouTube and blog tutorials

Community Support

Blazor GitHub

StackOverflow

Microsoft Learn and Docs

Reddit and Discord communities

YouTube tutorials

Monetization

Enterprise SaaS applications

Internal dashboards reducing licensing costs

Subscription-based web apps

Integration with payment APIs

Component library development for resale

Future Roadmap

Enhanced WebAssembly performance

Better support for mobile hybrid apps via MAUI

Expanded component libraries

Improved tooling in VS and VS Code

Greater ecosystem of reusable Blazor libraries

When Not To Use

Pure JavaScript environments with no .NET backend

SEO-critical apps requiring server-rendered HTML

Lightweight widgets where JS frameworks are simpler

High-performance gaming or graphics-heavy web apps

Projects without .NET skillset

Final Summary

Blazor is a .NET framework for building interactive web apps with C#.

Supports both WebAssembly (client-side) and Server hosting models.

Uses component-based architecture and Razor syntax.

Integrates seamlessly with ASP.NET Core and other .NET services.

Ideal for enterprise-grade web apps and full-stack .NET development.

Faq

Is Blazor free?

Yes - open-source under the .NET Foundation.

Can Blazor replace JavaScript frameworks?

For many web apps, yes; some JS interop may still be needed.

Which languages are used?

C# and Razor.

Does Blazor support mobile apps?

Yes, via MAUI integration.

Is WebAssembly faster than server-side Blazor?

WebAssembly runs client-side and reduces server load, but initial load is slower.

Code Sample Descriptions

1

Blazor Counter Example

@page "/counter"
<h3>Counter</h3>
<p>Current count: @currentCount</p>
<button class="btn btn-primary" @onclick="IncrementCount">+</button>
<button class="btn btn-danger" @onclick="DecrementCount">-</button>
<button class="btn btn-secondary" @onclick="ResetCount">Reset</button>
<button class="btn btn-warning" @onclick="ToggleTheme">Switch Theme</button>

@code {
    private int currentCount = 0
    private bool isDark = false

    private void IncrementCount() => currentCount++
    private void DecrementCount() => currentCount--
    private void ResetCount() => currentCount = 0

    private void ToggleTheme() {
        isDark = !isDark
        var body = document.body
        if (isDark) body.classList.add("dark-theme")
        else body.classList.remove("dark-theme")
    }
}

Demonstrates a simple counter component using Blazor WebAssembly with Razor syntax and C# for interactivity.

Let’s Try →
2

Blazor Todo List Example

@page "/todo"
<h3>Todo List</h3>
<input @bind="newTask" placeholder="Add new task" />
<button @onclick="AddTask">Add</button>
<ul>
    @foreach(var task in tasks) {
        <li>@task <button @onclick="() => RemoveTask(task)">Remove</button></li>
    }
</ul>

@code {
    private string newTask = ""
    private List<string> tasks = new List<string>()

    private void AddTask() {
        if(!string.IsNullOrWhiteSpace(newTask)) tasks.Add(newTask)
        newTask = ""
    }
    private void RemoveTask(string task) => tasks.Remove(task)
}

A minimal Blazor component that allows adding and removing tasks from a Todo list.

Let’s Try →
3

Blazor Toggle Visibility

@page "/toggle"
<h3>Toggle Message</h3>
<button @onclick="Toggle">Toggle</button>
@if(showMessage) <p>Hello Blazor!</p>

@code {
    private bool showMessage = true
    private void Toggle() => showMessage = !showMessage
}

A Blazor component to toggle visibility of a message.

Let’s Try →
4

Blazor Simple Form

@page "/form"
<h3>Simple Form</h3>
<input @bind="name" placeholder="Enter name" />
<p>Your name: @name</p>

@code {
    private string name = ""
}

A simple form that binds user input to a property and displays it.

Let’s Try →
5

Blazor List Rendering

@page "/list"
<h3>Fruits</h3>
<ul>
    @foreach(var fruit in fruits) {
        <li>@fruit</li>
    }
</ul>

@code {
    private List<string> fruits = new List<string>{"Apple","Banana","Cherry"}
}

Render a list of items dynamically using a Blazor component.

Let’s Try →
6

Blazor Counter with Step

@page "/counter-step"
<h3>Counter with Step</h3>
<p>Value: @count</p>
<input type="number" @bind="step" />
<button @onclick="() => count += step">+</button>
<button @onclick="() => count -= step">-</button>

@code {
    private int count = 0
    private int step = 1
}

A counter component that allows incrementing and decrementing by a custom step value.

Let’s Try →
7

Blazor Conditional Rendering

@page "/conditional"
<h3>Conditional Rendering</h3>
<button @onclick="Toggle">Toggle State</button>
@if(isActive) <p>Active State</p>
else <p>Inactive State</p>

@code {
    private bool isActive = false
    private void Toggle() => isActive = !isActive
}

Show different content based on a boolean property.

Let’s Try →
8

Blazor Two-Way Binding Example

@page "/twoway"
<h3>Two-Way Binding</h3>
<input @bind="text" />
<p>You typed: @text</p>

@code {
    private string text = ""
}

Demonstrates two-way binding in Blazor for input fields.

Let’s Try →
9

Blazor Counter with Async

@page "/async-counter"
<h3>Async Counter</h3>
<p>Value: @count</p>
<button @onclick="IncrementAsync">Increment Async</button>

@code {
    private int count = 0
    private async Task IncrementAsync() {
        await Task.Delay(500)
        count++
    }
}

A counter component that updates asynchronously after a delay.

Let’s Try →
10

Blazor Component Parameter Example

// Parent.razor
<h3>Parent</h3>
<Child Message="Hello from Parent" />

// Child.razor
<p>Message from parent: @Message</p>

@code {
    [Parameter] public string Message { get; set; }
}

A parent and child component example passing parameters in Blazor.

Let’s Try →

Frequently Asked Questions about Blazor

What is Blazor?

Blazor is a Microsoft framework for building interactive web applications using C# and .NET, running client-side via WebAssembly or server-side via SignalR.

What are the primary use cases for Blazor?

Building interactive web applications in C#. Creating reusable UI components. Developing full-stack .NET web apps. Integrating with ASP.NET Core APIs. Rapid prototyping and enterprise dashboards

What are the strengths of Blazor?

Write web apps entirely in C#. Share code between client and server. Strong tooling via Visual Studio and .NET CLI. Integrated security and authentication features. Enterprise-grade framework with long-term support

What are the limitations of Blazor?

WebAssembly apps may have larger initial load. Limited third-party UI components compared to JavaScript frameworks. Some JavaScript interop is still needed for advanced browser APIs. SEO optimization is more complex for WebAssembly apps. Smaller developer ecosystem than React or Angular

How can I practice Blazor typing speed?

CodeSpeedTest offers 10+ real Blazor code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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