Infosys ASP.NET Developer Interview Questions and Answers

Q1. Explain solid principle
Ans. 
SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses with...read more
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Q2. Why we use Sealed class
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Sealed class is used to prevent inheritance and ensure that the class cannot be extended.
• Prevents inheritance, ensuring that the class cannot be extended

• Helps in maintaining code integrity and security

• Used when a class is not intended to be inherited or overridden
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Q3. Types of constructor
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Types of constructors include default, parameterized, copy, and static constructors.
• Default constructor has no parameters

• Parameterized constructor takes one or more parameters

• Copy constructor creates a new object as a copy of an existing object

• Static constructor is used to initialize static data members
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Q4. . net core features?
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ASP.NET Core is a cross-platform, high-performance framework for building modern, cloud-based, internet-connected applications.
• Cross-platform support allows development on Windows, macOS, and Linux

• High performance with improved speed and scalability

• Modular design for flexibility and easy maintenance

• Built-in dependency injection for better code organization

• Support for Docker containers for easy deployment
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Q5. Explain Startup file?
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Startup file is a configuration file in ASP.NET that specifies settings and behavior for the application.
• Startup file is typically named 'Startup.cs' in ASP.NET Core projects.

• It contains configuration for services, middleware, and the request processing pipeline.

• The 'ConfigureServices' method is used to add services to the dependency injection container.

• The 'Configure' method is used to configure the HTTP request pipel...read more
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Q6. Dependency injection
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Q7. Explain Api lifetimes
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API lifetimes refer to the duration for which an API is available and supported.
• API lifetimes can vary depending on the service provider or platform.

• Some APIs may have a limited lifetime and be deprecated after a certain period.

• Developers should be aware of API lifetimes to plan for potential changes or updates.

• Regularly check for updates or announcements regarding API lifetimes to stay informed.
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Q8. Diffrent between transient vs scope
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Transient objects are created each time they are requested, while scoped objects are created once per request.
• Transient objects are created every time they are requested, leading to potentially higher memory usage.

• Scoped objects are created once per request and are shared within the scope of that request.

• Example: Transient objects are typically used for lightweight services, while scoped objects are used for services t...read more
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Q1. What is dependency injection
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Dependency injection is a design pattern in which a class receives its dependencies from external sources rather than creating them itself.
• Allows for better code reusability and testability

• Promotes loose coupling between classes

• Commonly used in ASP.NET Core for managing services and components
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Q2. View, primary key, unique key
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Q1. What are restful api's
Ans. 
RESTful APIs are a type of web service that follows the principles of REST (Representational State Transfer) architecture.
• RESTful APIs use standard HTTP methods like GET, POST, PUT, DELETE to perform CRUD operations on resources.

• They are stateless, meaning each request from a client to the server must contain all the information necessary to understand the request.

• RESTful APIs typically return data in JSON or XML forma...read more
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Q2. What are stored procedures
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Stored procedures are precompiled SQL queries stored in a database for reuse.
• Stored procedures are used to improve performance by reducing the need to send multiple queries to the database server.

• They can be parameterized to accept input values and return results.

• Stored procedures can contain logic and business rules, making them reusable and secure.

• Examples include procedures for inserting, updating, and deleting data...read more
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Q1. What is view state?
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View state is a hidden field on an ASP.NET web page that stores state information.
• View state is used to persist page and control state across postbacks.

• It is stored as a hidden field on the page and is encrypted by default.

• View state can be disabled to improve performance, but it may lead to loss of state information.
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Q2. Different view state in asp.net ?
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View state is used to persist the state of a web form across postbacks in ASP.NET.
• View state can be enabled or disabled at the page level or control level.

• Different types of view state include enabled, disabled, and encrypted.

• View state can be used to store values of controls on a web form between postbacks.
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Q1. What was your role in your last project
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In my last project, I served as a lead ASP.NET developer, overseeing the development and implementation of a web application.
• Led a team of 5 developers in creating a robust e-commerce platform using ASP.NET Core.

• Implemented RESTful APIs for seamless integration with third-party services, enhancing functionality.

• Conducted code reviews and provided mentorship to junior developers, improving code quality and team skills.

• C...read more
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Basic Opps and technical questions related to ASP.Net Core

Q1. Agile methodologies
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