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50 Angular Interview Questions for .NET Developers – Basic to Advanced

November 7, 2026 5 min read , , , , , , ,

Angular is a TypeScript-based frontend framework used to build dynamic, responsive, and single-page web applications. For .NET developers, Angular is particularly useful for creating frontend applications that communicate with ASP.NET Core Web APIs.

Understanding Angular fundamentals, components, services, routing, forms, HTTP communication, and authentication helps .NET developers work effectively across both frontend and backend layers.

This question bank covers 50 important Angular interview questions from a .NET developer's perspective, progressing from basic concepts to intermediate and advanced topics.

Section 1: Angular Fundamentals

  1. What is Angular, and why is it used in web application development?

  2. What is the difference between Angular and AngularJS?

  3. What is TypeScript, and why does Angular use it?

  4. What is a Single Page Application (SPA)?

  5. What is the difference between a traditional MVC application and an Angular SPA?

  6. What is a component in Angular?

  7. What are the main files generated when creating an Angular component?

  8. What is the purpose of app.component.ts and app.component.html?

  9. What is the difference between a component and a module in Angular?

  10. What are standalone components, and how are they different from NgModules?

Section 2: Components, Data Binding, and Directives

  1. What are the different types of data binding in Angular?

  2. What is the difference between interpolation and property binding?

  3. What is event binding in Angular?

  4. What is two-way data binding, and how does [(ngModel)] work?

  5. What are directives in Angular?

  6. What is the difference between structural and attribute directives?

  7. What is the difference between *ngIf and *ngFor?

  8. What is the purpose of ngClass and ngStyle?

  9. How do you pass data from a parent component to a child component?

  10. How do you send data from a child component to a parent component?

Section 3: Services, Dependency Injection, and Routing

  1. What is a service in Angular, and why should business logic be placed in services?

  2. What is dependency injection in Angular?

  3. What is the purpose of the @Injectable() decorator?

  4. What does providedIn: 'root' mean?

  5. How is Angular dependency injection conceptually similar to dependency injection in ASP.NET Core?

  6. What is Angular routing?

  7. What is the purpose of RouterOutlet and RouterLink?

  8. What is the difference between route parameters and query parameters?

  9. What are route guards, and why are they used?

  10. How do you implement lazy loading in Angular?

Section 4: Forms and API Integration with .NET

  1. What is the difference between template-driven forms and reactive forms?

  2. What is FormGroup, FormControl, and FormBuilder?

  3. How do you implement form validation in Angular?

  4. How do you display validation errors received from an ASP.NET Core Web API?

  5. What is HttpClient in Angular?

  6. How do you call a GET API from an ASP.NET Core Web API using Angular?

  7. How do you send POST, PUT, PATCH, and DELETE requests from Angular?

  8. What is the purpose of RxJS Observables in Angular HTTP communication?

  9. What is the difference between Observable and Promise?

  10. How do you handle API errors and HTTP status codes such as 400, 401, 403, and 500 in Angular?

Section 5: Authentication, Security, and Advanced Integration

  1. How do you integrate Angular with JWT authentication implemented in ASP.NET Core Web API?

  2. What is an HTTP interceptor in Angular?

  3. How can an Angular HTTP interceptor automatically attach an authorization token to API requests?

  4. What is the difference between frontend route guards and backend API authorization?

  5. Why should authorization always be enforced on the ASP.NET Core Web API even when Angular route guards are implemented?

  6. What is CORS, and why does it matter when Angular and ASP.NET Core Web API run on different origins?

  7. How do you manage environment-specific API base URLs in Angular?

  8. How do you configure Angular to communicate with an ASP.NET Core Web API hosted on IIS or Azure?

  9. How do you handle token expiration and unauthorized API responses in an Angular application?

  10. What are the important considerations when deploying an Angular frontend and ASP.NET Core Web API as separate applications?

Important Note

This question bank focuses on Angular concepts that are particularly useful for .NET developers working on full-stack applications.

The emphasis is on understanding frontend architecture, component communication, dependency injection, forms, API integration, HTTP communication, and authentication with ASP.NET Core Web API rather than advanced Angular-specific UI engineering.

A .NET developer who understands these concepts can contribute more effectively to end-to-end application development using Angular and ASP.NET Core.

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