Syllabus

ASP.NET Core Complete Tutorial (ShopNest)

Module 1: Foundations
What is ASP.NET Core? Complete Guide Setting Up ASP.NET Core Development Environment ASP.NET Core Project Structure Explained MVC Architecture in ASP.NET Core — Complete Guide Controllers and Actions in ASP.NET Core Routing in ASP.NET Core — Conventional and Attribute Routing Views and Razor Syntax in ASP.NET Core Layouts, Partial Views and View Components Models and ViewModels in ASP.NET Core Forms, Model Binding and Validation in ASP.NET Core Tag Helpers in ASP.NET Core — Complete Guide Static Files, Bundling and Minification in ASP.NET Core
Module 2: Entity Framework Core
Entity Framework Core — Introduction and Setup EF Core Code First — Models, Migrations, Database EF Core CRUD Operations — Create, Read, Update, Delete EF Core LINQ Queries — Beginner to Advanced EF Core Relationships — One-to-One, One-to-Many, Many-to-Many EF Core Fluent API — Advanced Configuration EF Core Repository Pattern and Unit of Work EF Core Performance Optimization Database First Approach with EF Core (Scaffold) EF Core with SQL Server — Advanced Features
Module 3: Dependency Injection & Middleware
Dependency Injection in ASP.NET Core — Complete Guide Middleware in ASP.NET Core — Complete Guide Configuration in ASP.NET Core — appsettings, Environment Variables, Secrets Filters in ASP.NET Core — Action, Authorization, Exception, Resource, Result Logging in ASP.NET Core — ILogger, Serilog, NLog Error Handling and Exception Management in ASP.NET Core
Module 4: Authentication & Security
ASP.NET Core Identity — Complete Setup Guide Authentication in ASP.NET Core — Cookie and JWT Authorization in ASP.NET Core — Roles, Policies, Claims JWT Authentication with Refresh Tokens — Complete Implementation OAuth2 and External Login (Google, Facebook, Microsoft) Data Protection and Encryption in ASP.NET Core HTTPS, SSL Certificates and Security Best Practices
Module 5: Web API
Building REST APIs with ASP.NET Core — Complete Guide API Versioning in ASP.NET Core Swagger / OpenAPI Documentation in ASP.NET Core Input Validation in Web APIs — FluentValidation and Data Annotations Pagination, Filtering and Sorting in ASP.NET Core APIs HTTP Client and Consuming External APIs in ASP.NET Core Minimal APIs in ASP.NET Core .NET 8 SignalR — Real-Time Web Applications
Module 6: Advanced Architecture
Clean Architecture in ASP.NET Core CQRS Pattern with MediatR in ASP.NET Core Repository Pattern — Deep Dive with Generic Repository Background Services and Hosted Services in ASP.NET Core Caching in ASP.NET Core — In-Memory, Distributed, Redis Health Checks in ASP.NET Core AutoMapper in ASP.NET Core Microservices with ASP.NET Core — Introduction Message Queues with RabbitMQ / Azure Service Bus in ASP.NET Core gRPC with ASP.NET Core
Module 7: Testing
Unit Testing ASP.NET Core with xUnit and Moq Integration Testing in ASP.NET Core Testing EF Core — In-Memory vs SQLite Performance Testing and Load Testing ASP.NET Core APIs Test-Driven Development (TDD) in ASP.NET Core
Module 8: Deployment & DevOps
Deploying ASP.NET Core to IIS on Windows Server Docker and Containerization for ASP.NET Core Deploying ASP.NET Core to Azure App Service CI/CD with GitHub Actions for ASP.NET Core Azure SQL Database with ASP.NET Core Environment Configuration and Secrets Management
Module 9: Real-World Projects
Build a Complete Blog Website with ASP.NET Core MVC Build an E-Commerce Product Catalog API (ASP.NET Core Web API) Build a Student Management System (Complete CRUD App) Build a Job Portal (Full Stack ASP.NET Core) Build a REST API with Clean Architecture — Complete Guide Build a Real-Time Chat App with SignalR and ASP.NET Core
Module 10: Advanced Topics
Blazor WebAssembly and Blazor Server — Complete Guide gRPC, GraphQL and Alternative API Styles in ASP.NET Core Rate Limiting and API Throttling in ASP.NET Core .NET 8 Output Caching in ASP.NET Core .NET 8 ASP.NET Core .NET 9 New Features — Complete Guide
ASP.NET Core Complete Tutorial (ShopNest)
Lesson 33 of 75 44% of course

OAuth2 and External Login (Google, Facebook, Microsoft)

1 · 5 min · 5/24/2026

Learn OAuth2 and External Login (Google, Facebook, Microsoft) in our free ASP.NET Core Complete Tutorial (ShopNest) series. Step-by-step explanations, examples, and interview tips on Toolliyo Academy.

Sign in to track progress and bookmarks.

OAuth2 and External Login (Google, Facebook, Microsoft) — ShopNest
Article 33 of 75 · Module 4: Authentication & Security · ShopNest Social Login E-Commerce
Target keyword: oauth2 asp.net core · Read time: ~30 min · .NET: 8 / 9 · Project: ShopNest Social Login E-Commerce

Introduction

ShopNest customers expect Sign in with Google — OAuth2 lets users authenticate via external providers while Identity stores the local account link.

After this article you will

  • Explain OAuth2 authorization code flow simply
  • Configure Google, Facebook, Microsoft providers
  • Link external logins to existing local accounts
  • Handle email-already-registered conflicts
  • Retrieve profile data from provider claims

Prerequisites

Concept deep-dive

OAuth2 flow (simplified): User clicks Google → redirect to Google → user consents → Google redirects back with code → ShopNest exchanges code for tokens → create/link Identity user → sign in with cookie.

builder.Services.AddAuthentication()
    .AddGoogle(options =>
    {
        options.ClientId = config["Authentication:Google:ClientId"]!;
        options.ClientSecret = config["Authentication:Google:ClientSecret"]!;
    })
    .AddFacebook(options => { ... })
    .AddMicrosoftAccount(options => { ... });

// AccountController external login callback
var info = await _signInManager.GetExternalLoginInfoAsync();
var signInResult = await _signInManager.ExternalLoginSignInAsync(
    info.LoginProvider, info.ProviderKey, isPersistent: false);

if (!signInResult.Succeeded)
{
    var email = info.Principal.FindFirstValue(ClaimTypes.Email);
    var user = await _userManager.FindByEmailAsync(email) ?? new ApplicationUser { ... };
    await _userManager.CreateAsync(user);
    await _userManager.AddLoginAsync(user, info);
    await _signInManager.SignInAsync(user, isPersistent: false);
}

Google setup: Google Cloud Console → OAuth client ID → authorized redirect URI: https://localhost:7xxx/signin-google

Hands-on — ShopNest Social Login E-Commerce

  1. Register Google OAuth app; store ClientId/Secret in User Secrets.
  2. Add Google button on login page.
  3. Link external login to existing email/password account (account settings).
  4. Show provider avatar from claim picture URL.

Common errors & best practices

  • Redirect URI mismatch — exact match required in provider console.
  • Creating duplicate users on each Google login — always AddLoginAsync.
  • Client secret in frontend — secret stays server-side only.

Interview questions

Q: OAuth2 vs OpenID Connect?
A: OAuth2 authorizes API access; OIDC adds identity layer (id_token with user info). Google login uses OIDC.

Q: Link external to local account?
A: UserManager.AddLoginAsync associates provider key with Identity user.

Summary

  • OAuth2 external login reduces password friction
  • Identity stores external login provider + key
  • Handle duplicate email across providers gracefully
  • Secrets in User Secrets, redirect URIs exact match

Previous: JWT with Refresh Tokens
Next: Data Protection and Encryption

FAQ

Facebook app review?

Development mode limited to test users until app review for production.

Store provider access token?

Optional in AspNetUserTokens if calling provider APIs later.

Interview Q&A for this course

Test your knowledge

Quizzes linked to this course—pass to earn certificates.

SOLID Design Principles — Practice Quiz
Test your understanding of SOLID Design Principles Tutorial. Single responsibility, open/c…
Intermediate 15 min
SignalR Real-Time — Practice Quiz
Test your understanding of SignalR Real-Time Tutorial. WebSockets, hubs, and live updates …
Intermediate 15 min
Microservices with .NET — Practice Quiz
Test your understanding of Microservices with .NET. Distributed systems, APIs, messaging, …
Intermediate 15 min
LINQ — Practice Quiz
Test your understanding of LINQ Tutorial. Query in-memory and database data with fluent LI…
Intermediate 15 min
Entity Framework Core — Practice Quiz
Test your understanding of Entity Framework Core Tutorial. Modern ORM: Code First, migrati…
Intermediate 15 min
Design Patterns in C# — Practice Quiz
Test your understanding of Design Patterns in C#. Creational, structural, and behavioral p…
Intermediate 15 min
Browse all quizzes
Previous Next
ASP.NET Core Complete Tutorial (ShopNest)

On this page

Introduction After this article you will Prerequisites Concept deep-dive Hands-on — ShopNest Social Login E-Commerce Common errors & best practices Interview questions Summary FAQ Facebook app review? Store provider access token?
Module 1: Foundations
What is ASP.NET Core? Complete Guide Setting Up ASP.NET Core Development Environment ASP.NET Core Project Structure Explained MVC Architecture in ASP.NET Core — Complete Guide Controllers and Actions in ASP.NET Core Routing in ASP.NET Core — Conventional and Attribute Routing Views and Razor Syntax in ASP.NET Core Layouts, Partial Views and View Components Models and ViewModels in ASP.NET Core Forms, Model Binding and Validation in ASP.NET Core Tag Helpers in ASP.NET Core — Complete Guide Static Files, Bundling and Minification in ASP.NET Core
Module 2: Entity Framework Core
Entity Framework Core — Introduction and Setup EF Core Code First — Models, Migrations, Database EF Core CRUD Operations — Create, Read, Update, Delete EF Core LINQ Queries — Beginner to Advanced EF Core Relationships — One-to-One, One-to-Many, Many-to-Many EF Core Fluent API — Advanced Configuration EF Core Repository Pattern and Unit of Work EF Core Performance Optimization Database First Approach with EF Core (Scaffold) EF Core with SQL Server — Advanced Features
Module 3: Dependency Injection & Middleware
Dependency Injection in ASP.NET Core — Complete Guide Middleware in ASP.NET Core — Complete Guide Configuration in ASP.NET Core — appsettings, Environment Variables, Secrets Filters in ASP.NET Core — Action, Authorization, Exception, Resource, Result Logging in ASP.NET Core — ILogger, Serilog, NLog Error Handling and Exception Management in ASP.NET Core
Module 4: Authentication & Security
ASP.NET Core Identity — Complete Setup Guide Authentication in ASP.NET Core — Cookie and JWT Authorization in ASP.NET Core — Roles, Policies, Claims JWT Authentication with Refresh Tokens — Complete Implementation OAuth2 and External Login (Google, Facebook, Microsoft) Data Protection and Encryption in ASP.NET Core HTTPS, SSL Certificates and Security Best Practices
Module 5: Web API
Building REST APIs with ASP.NET Core — Complete Guide API Versioning in ASP.NET Core Swagger / OpenAPI Documentation in ASP.NET Core Input Validation in Web APIs — FluentValidation and Data Annotations Pagination, Filtering and Sorting in ASP.NET Core APIs HTTP Client and Consuming External APIs in ASP.NET Core Minimal APIs in ASP.NET Core .NET 8 SignalR — Real-Time Web Applications
Module 6: Advanced Architecture
Clean Architecture in ASP.NET Core CQRS Pattern with MediatR in ASP.NET Core Repository Pattern — Deep Dive with Generic Repository Background Services and Hosted Services in ASP.NET Core Caching in ASP.NET Core — In-Memory, Distributed, Redis Health Checks in ASP.NET Core AutoMapper in ASP.NET Core Microservices with ASP.NET Core — Introduction Message Queues with RabbitMQ / Azure Service Bus in ASP.NET Core gRPC with ASP.NET Core
Module 7: Testing
Unit Testing ASP.NET Core with xUnit and Moq Integration Testing in ASP.NET Core Testing EF Core — In-Memory vs SQLite Performance Testing and Load Testing ASP.NET Core APIs Test-Driven Development (TDD) in ASP.NET Core
Module 8: Deployment & DevOps
Deploying ASP.NET Core to IIS on Windows Server Docker and Containerization for ASP.NET Core Deploying ASP.NET Core to Azure App Service CI/CD with GitHub Actions for ASP.NET Core Azure SQL Database with ASP.NET Core Environment Configuration and Secrets Management
Module 9: Real-World Projects
Build a Complete Blog Website with ASP.NET Core MVC Build an E-Commerce Product Catalog API (ASP.NET Core Web API) Build a Student Management System (Complete CRUD App) Build a Job Portal (Full Stack ASP.NET Core) Build a REST API with Clean Architecture — Complete Guide Build a Real-Time Chat App with SignalR and ASP.NET Core
Module 10: Advanced Topics
Blazor WebAssembly and Blazor Server — Complete Guide gRPC, GraphQL and Alternative API Styles in ASP.NET Core Rate Limiting and API Throttling in ASP.NET Core .NET 8 Output Caching in ASP.NET Core .NET 8 ASP.NET Core .NET 9 New Features — Complete Guide