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Learn Blazor-wasm - 10 Code Examples & CST Typing Practice Test

Blazor WebAssembly (WASM) is a client-side web framework from Microsoft that allows developers to build interactive web applications using C# and .NET instead of JavaScript. Applications run directly in the browser via WebAssembly.

View all 10 Blazor-wasm code examples →
Simple Blazor WebAssembly ComponentBlazor Component with Button ClickBlazor Component with Two-Way BindingBlazor Component with Conditional RenderingBlazor Component with LoopBlazor Component with Event CallbackBlazor Component with Cascading ParameterBlazor Component with TimerBlazor Component with Form ValidationBlazor Component with Nested Components

Learn BLAZOR-WASM with Real Code Examples

Updated Nov 25, 2025

Explain

Blazor WASM enables full-stack C# development, running .NET code in the browser.

Uses WebAssembly to compile .NET IL (Intermediate Language) into a binary format that browsers can execute.

Supports component-based architecture, enabling reusable UI elements.

Integrates seamlessly with .NET ecosystem, including libraries, dependency injection, and tooling.

Runs entirely client-side, reducing server load and enabling offline capabilities.

Core Features

Razor components for UI development

Two-way data binding

Event handling in C# instead of JavaScript

JavaScript interop for accessing browser APIs

Lazy loading and modular assemblies to reduce payload

Basic Concepts Overview

Razor Component - UI element written in C# and Razor syntax

Binding - two-way connection between UI and data model

Event Callback - handles user interactions in C#

Dependency Injection - inject services into components

Routing - navigate between components in SPA

Project Structure

wwwroot/ - static assets (JS, CSS, images)

Pages/ - Razor components mapped to routes

Shared/ - reusable components and layouts

Program.cs - application entry point and DI configuration

_Imports.razor - global using directives

App.razor - root component defining router and layout

Building Workflow

Define Razor components (.razor files)

Add C# logic for UI interactivity

Configure services and dependency injection

Set up routing for navigation between components

Test locally and debug using browser and .NET tools

Difficulty Use Cases

Beginner: create basic SPA with navigation

Intermediate: integrate REST API and data binding

Advanced: use JavaScript interop and custom components

Expert: implement offline caching and PWA features

Auditor: optimize performance and bundle size

Comparisons

Blazor WASM vs React: Blazor uses C#, React uses JS/TS

Blazor WASM vs Angular: Blazor SPA runs in .NET runtime, Angular compiles to JS

Blazor WASM vs Vue.js: Blazor integrates with .NET ecosystem natively

Blazor WASM vs Blazor Server: WASM runs client-side, Server runs on backend

Blazor WASM vs JS frameworks: Strong typing and tooling with C#

Versioning Timeline

2018 - Blazor introduced with Server-side prototype

2019 - Blazor WebAssembly experimental release

2020 - Blazor WASM stable release with .NET Core 3.1

2021 - .NET 5 Blazor enhancements and performance improvements

2022-2025 - Continuous improvements, .NET 6/7/8 support, PWA features, tooling enhancements

Glossary

Razor Component - reusable UI block

WebAssembly - binary instruction format for browsers

Two-way binding - synchronize UI with data model

JS Interop - call JS functions from C#

PWA - progressive web app with offline support

Installation Setup

Install .NET SDK (latest stable version)

Install Visual Studio 2022 or VS Code with C# extension

Create a new Blazor WebAssembly project (`dotnet new blazorwasm`)

Run project locally (`dotnet run`)

Deploy project as static web app or integrated with ASP.NET Core backend

Environment Setup

Install .NET SDK and runtime

Install Visual Studio or VS Code

Create Blazor WASM project via CLI

Configure optional backend API

Run project locally and test browser functionality

Config Files

Program.cs - app entry point and DI setup

wwwroot/ - static assets

_Imports.razor - global usings

App.razor - root component with router

Pages/*.razor - page-level components

Cli Commands

dotnet new blazorwasm - create project

dotnet run - run locally

dotnet build - compile project

dotnet publish - produce deployable output

dotnet add package <name> - add NuGet dependency

Internationalization

Use .NET localization and resource files

Support for multiple cultures and languages

Dynamic culture switching at runtime

Integrates with ASP.NET Core localization for backend

Developer-defined text and content translations

Accessibility

Components render standard HTML with ARIA support

Keyboard navigation supported by default in standard components

Screen readers can access UI content

Integration with third-party accessibility libraries

Focus management supported via Blazor lifecycle hooks

Ui Styling

CSS isolation per component

Support for Bootstrap or custom frameworks

Third-party UI component libraries

Razor syntax allows inline markup with C#

Supports theming and responsive design

State Management

Component-local state stored in C# fields/properties

Shared state via singleton services

Persistent state via local storage or IndexedDB

Event callbacks update UI reactively

No server-side state required for basic SPA

Data Management

Input via forms and events

Output rendered in components

API calls to backend services via HttpClient

Local storage for persistence

Use of Observable or reactive patterns for data flow

Architecture

Razor components compiled into .NET assemblies

.NET runtime and assemblies downloaded to browser via WebAssembly

Components handle rendering, events, and data binding

JavaScript interop enables browser API access

Optionally integrates with ASP.NET Core backends via HTTP or gRPC

Rendering Model

Razor components rendered in browser DOM

Event callbacks handled in C#

State changes trigger re-render of affected components

Optional JS interop for APIs and DOM manipulation

PWA caching enables offline rendering

Architectural Patterns

Client-side SPA with routing

Component-based UI with shared state

Dependency injection for services

JS interop for browser APIs

Optional API integration with backend services

Real World Architectures

Enterprise SPA with API backend

PWA for offline-first corporate applications

Interactive dashboards with charting components

Line-of-business applications ported from desktop apps

Real-time apps using SignalR for notifications

Design Principles

Component-based SPA architecture

Client-side execution via WebAssembly

Strong .NET ecosystem integration

Developer productivity via tooling and debugging

Security through sandboxed browser execution

Scalability Guide

Minimize initial download payload with lazy loading

Split components into modular assemblies

Use caching for repeated data

Optimize rendering and data-binding for performance

Leverage PWA caching for offline scenarios

Migration Guide

Move existing Razor or .NET components to Blazor project

Refactor backend logic for client-side execution where possible

Replace JS logic with C# using Blazor features

Test API integration for client-side calls

Optimize component load and payload for performance

Performance Notes

Initial download can be optimized using lazy loading

Browser caching improves repeat load times

Use trimming and AOT compilation to reduce size

Client-side execution is limited by browser CPU

PWA caching can improve offline experience

Security Notes

Code runs in browser sandbox, preventing system access

Use HTTPS for API communication

Sensitive data should be stored on server-side

Authentication/authorization handled via ASP.NET Core Identity or JWT

Cross-site scripting mitigations via Razor automatic encoding

Monitoring Analytics

Browser console for debugging

Remote logging via API integration

Performance profiling using browser dev tools

Telemetry collection via Application Insights

Track API call performance and component render times

Code Quality

Keep components modular and reusable

Use proper naming conventions

Write unit and integration tests for components

Monitor performance for large component trees

Follow Blazor lifecycle and state management best practices

Practical Examples

To-do application with local storage

Client-side dashboard with charts and API integration

Form-based enterprise application

Offline-capable PWA

Interactive data visualization with Blazor components

Troubleshooting

Check browser console for WebAssembly load errors

Ensure correct assembly references

Verify service registrations for DI

Monitor network requests for API calls

Check component lifecycle methods for correct execution

Testing Guide

Unit test components using bUnit

Integration tests with Playwright or Selenium

Debug using browser developer tools

Check API integration with mock services

Test PWA offline functionality

Deployment Options

Static hosting on Azure Static Web Apps or GitHub Pages

Integrated with ASP.NET Core server for full-stack deployment

Docker container deployment

PWA hosted on CDN for offline-first apps

Use CI/CD pipelines for automated deployment

Tools Ecosystem

.NET SDK and runtime

Visual Studio/VS Code tooling

NuGet package ecosystem

Blazor DevTools for browser debugging

Third-party component libraries (Radzen, Telerik, MudBlazor)

Integrations

ASP.NET Core Web API for backend data

JavaScript libraries via JS interop

IdentityServer or Azure AD for authentication

SignalR for real-time communication

PWA support for offline apps

Productivity Tips

Reuse components across projects

Use dependency injection for shared services

Leverage existing .NET libraries

Optimize lazy loading and bundling

Use Visual Studio/VS Code productivity extensions

Challenges

Large payload and slow initial load

Browser debugging for WASM code

Interop between JS and C#

Component lifecycle management

Optimizing performance for mobile devices

Learning Path

Learn C# and .NET fundamentals

Understand Razor syntax and components

Explore Blazor component lifecycle

Integrate with ASP.NET Core backend

Build sample SPA applications

Skill Improvement Plan

Week 1: C# and .NET basics

Week 2: Razor components and data binding

Week 3: API integration and DI

Week 4: JavaScript interop and advanced components

Week 5: PWA features and deployment optimization

Interview Questions

What is Blazor WebAssembly?

How does Blazor differ from Blazor Server?

Explain Razor components and their lifecycle

How is dependency injection used in Blazor?

Compare Blazor WASM to React or Angular

Cheat Sheet

dotnet new blazorwasm - create a new Blazor WASM project

dotnet run - run project locally

@code { } - define component logic in Razor file

@inject - inject service into component

NavigationManager.NavigateTo() - programmatic navigation

Books

Blazor in Action

Hands-On Blazor WebAssembly

Pro ASP.NET Core Blazor

Modern Web Development with Blazor

Mastering Blazor

Tutorials

Create your first Blazor WASM app

Build a SPA with routing and components

Integrate REST API with HttpClient

Use dependency injection in Blazor components

Deploy Blazor WASM as a PWA or static web app

Official Docs

https://learn.microsoft.com/en-us/aspnet/core/blazor/?view=aspnetcore-8.0

https://dotnet.microsoft.com/apps/aspnet/web-apps/blazor

Community Links

Blazor GitHub repository

Microsoft Q&A for Blazor

StackOverflow Blazor tag

Blazor subreddit

Official Microsoft Blazor documentation

Community Support

Blazor GitHub repository

Microsoft Q&A for Blazor

StackOverflow Blazor tag

Blazor subreddit

Official Microsoft Blazor documentation and samples

Monetization

Enterprise applications as SaaS

Internal line-of-business tools

Progressive web apps for clients

Interactive dashboards and analytics portals

Cross-platform web applications replacing desktop clients

Future Roadmap

Improved WebAssembly performance and size reduction

Enhanced tooling and debugging support

Better PWA integration and offline features

Expanded third-party component ecosystem

Stronger integration with .NET MAUI for hybrid apps

When Not To Use

Applications needing SEO without prerendering

Very large-scale SPAs requiring minimal payload

Browsers without WebAssembly support

CPU-intensive client-side computations

Projects without .NET developer expertise

Final Summary

Blazor WASM enables client-side web apps using C# and .NET.

Runs in the browser via WebAssembly with full .NET support.

Component-based architecture allows reusable UI blocks.

Integrates with ASP.NET Core for API, auth, and backend services.

Ideal for .NET developers building SPAs without JavaScript.

Faq

Is Blazor WASM free?

Yes - open-source as part of .NET runtime.

Does Blazor run on all browsers?

Modern browsers with WebAssembly support are required.

Can I use existing .NET libraries?

Yes - compatible libraries can run in WASM.

How is authentication handled?

Via ASP.NET Core Identity, JWT, or external providers.

Can Blazor WASM work offline?

Yes - using PWA caching and local storage.

Code Sample Descriptions

1

Simple Blazor WebAssembly Component

# blazor/demo/Hello.razor
<h3>Hello, Blazor!</h3>

@code {
    private string message = "Hello, Blazor!";
}

A basic Blazor WebAssembly component displaying 'Hello, Blazor!' in the browser.

Let’s Try →
2

Blazor Component with Button Click

# blazor/demo/ButtonClick.razor
<h3>@message</h3>
<button @onclick="UpdateMessage">Click Me</button>

@code {
    private string message = "Click the button!";
    private void UpdateMessage() {
        message = "Button clicked!";
    }
}

A component that updates a message when a button is clicked.

Let’s Try →
3

Blazor Component with Two-Way Binding

# blazor/demo/TwoWayBinding.razor
<input @bind="name" placeholder="Enter your name" />
<p>Hello, @name!</p>

@code {
    private string name = "";
}

A component using two-way binding with an input field.

Let’s Try →
4

Blazor Component with Conditional Rendering

# blazor/demo/Conditional.razor
@if (isLoggedIn) {
    <p>Welcome back!</p>
} else {
    <p>Please log in.</p>
}

@code {
    private bool isLoggedIn = false;
}

A component that shows different content based on a condition.

Let’s Try →
5

Blazor Component with Loop

# blazor/demo/Loop.razor
<ul>
@foreach (var item in items) {
    <li>@item</li>
}
</ul>

@code {
    private List<string> items = new List<string> { "Item 1", "Item 2", "Item 3" };
}

A component displaying a list of items using a loop.

Let’s Try →
6

Blazor Component with Event Callback

# blazor/demo/EventCallback.razor
<ChildComponent OnNotify="HandleNotification" />
<p>@message</p>

@code {
    private string message = "Waiting for notification...";
    private void HandleNotification(string msg) {
        message = msg;
    }
}

// ChildComponent.razor
<button @onclick="NotifyParent">Notify Parent</button>

@code {
    [Parameter] public EventCallback<string> OnNotify { get; set; }
    private async Task NotifyParent() {
        await OnNotify.InvokeAsync("Notification received!");
    }
}

A parent and child component demonstrating event callbacks.

Let’s Try →
7

Blazor Component with Cascading Parameter

# blazor/demo/Cascading.razor
<CascadingValue Value="username">
    <ChildComponent />
</CascadingValue>

@code {
    private string username = "BlazorUser";
}

// ChildComponent.razor
<p>Welcome, @Username!</p>

@code {
    [CascadingParameter] public string Username { get; set; }
}

A component using cascading parameters for shared state.

Let’s Try →
8

Blazor Component with Timer

# blazor/demo/Timer.razor
<p>Current Time: @currentTime</p>

@code {
    private string currentTime;
    protected override void OnInitialized() {
        var timer = new System.Timers.Timer(1000);
        timer.Elapsed += (s, e) => {
        currentTime = DateTime.Now.ToString("HH:mm:ss");
        InvokeAsync(StateHasChanged);
        };
        timer.Start();
    }
}

A component updating the time every second.

Let’s Try →
9

Blazor Component with Form Validation

# blazor/demo/FormValidation.razor
<EditForm Model="user" OnValidSubmit="HandleValidSubmit">
    <InputText @bind-Value="user.Name" />
    <button type="submit">Submit</button>
</EditForm>
<p>@message</p>

@code {
    private User user = new User();
    private string message;
    private void HandleValidSubmit() {
        message = $"Hello, {user.Name}!";
    }
    class User { public string Name { get; set; } }
}

A component demonstrating simple form validation.

Let’s Try →
10

Blazor Component with Nested Components

# blazor/demo/Nested.razor
@foreach (var i in Enumerable.Range(1, 3)) {
    <ChildComponent Number="i" />
}

// ChildComponent.razor
<p>Child component number: @Number</p>

@code {
    [Parameter] public int Number { get; set; }
}

A parent component rendering multiple child components dynamically.

Let’s Try →

Frequently Asked Questions about Blazor-wasm

What is Blazor-wasm?

Blazor WebAssembly (WASM) is a client-side web framework from Microsoft that allows developers to build interactive web applications using C# and .NET instead of JavaScript. Applications run directly in the browser via WebAssembly.

What are the primary use cases for Blazor-wasm?

Interactive single-page applications (SPAs) with C#. Line-of-business applications requiring .NET libraries. Client-side applications with offline capabilities. Web apps needing tight integration with ASP.NET Core backends. Modern web UI replacement for WinForms/WPF apps

What are the strengths of Blazor-wasm?

Leverages existing .NET skills and libraries. C# code runs natively in the browser via WebAssembly. Component reuse between server-side and client-side Blazor. Strong Microsoft tooling support (Visual Studio, CLI, debugging). Secure execution sandboxed in the browser

What are the limitations of Blazor-wasm?

Initial download size can be large compared to JS frameworks. Browser compatibility depends on WebAssembly support (modern browsers only). SEO is challenging without prerendering. Limited ecosystem compared to JavaScript frameworks. Client-side execution may not be ideal for CPU-intensive tasks

How can I practice Blazor-wasm typing speed?

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

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