V2Solutions Interview Questions and Answers

Forms authentication in MVC is implemented by configuring the web.config file and using the Authorize attribute in controllers.

• Configure forms authentication in web.config file

• Use Authorize attribute in controllers to restrict access to authenticated users

• Set authentication cookie upon successful login

The null coalescing operator (??) is used to provide a default value for nullable types if the value is null.

• Null coalescing operator (??) is used to return the left-hand operand if the operand is not null, otherwise it returns the right-hand operand.

• Example: int? x = null; int y = x ?? -1; // y will be -1 since x is null

• It is commonly used with nullable types to provide a default value if the nullable type is nul...read more

Static middleware is used in web development to serve static files such as HTML, CSS, and images.

• Static middleware is a piece of Express.js middleware that serves static files from a specified directory.

• It is commonly used to serve files like HTML, CSS, images, and JavaScript.

• Static middleware can be added to an Express application using the 'express.static' method.

• Example: app.use(express.static('public')) will s...read more

Analyze the provided React code to identify issues and suggest improvements.

• Check for component reusability: Ensure components are modular and reusable.

• Optimize performance: Use React.memo or useCallback to prevent unnecessary re-renders.

• Manage state effectively: Consider using Context API or Redux for global state management.

• Ensure accessibility: Use semantic HTML and ARIA roles for better accessibility.

• Follow be...read more

OOPS examples in real life

• Inheritance: Children inheriting traits from parents

• Polymorphism: A person can be a student, teacher, or employee at different times

• Encapsulation: A car's engine is encapsulated and hidden from the user

• Abstraction: A TV remote has buttons that abstract the complex functions of the TV

• Interface: A USB port is an interface that allows different devices to connect

A stack is a data structure that follows Last-In-First-Out (LIFO) principle, while a queue follows First-In-First-Out (FIFO) principle. A linked list is a linear data structure where each element is a separate object with a pointer to the next element.

• Stack is like a stack of plates, where the last plate added is the first one to be removed. Example: undo-redo functionality in a text editor.

• Queue is like a queue o...read more