Polestar Solutions & Services India Interview Questions and Answers

Dependency Injection in ASP.NET Core is registered in ConfigureServices method of Startup class.

• Add services.AddSingleton(); for singleton lifetime

• Add services.AddScoped(); for scoped lifetime

• Add services.AddTransient(); for transient lifetime

To improve performance of a Stored procedure, optimize query, use indexes, minimize data retrieval, and avoid cursors.

• Optimize query by using proper indexing

• Minimize data retrieval by fetching only required columns

• Avoid using cursors for looping through data

• Use SET NOCOUNT ON to stop the message indicating the number of rows affected by a Transact-SQL statement

Read-only variables can be modified by the program, while const variables cannot be changed.

• Read-only variables can be modified by the program during runtime, while const variables cannot be changed at all.

• Using 'const' keyword ensures that the value of the variable remains constant throughout the program.

• Read-only variables are typically used when the value needs to be initialized at runtime, while const variables are used for values that should not change.

• Example: int readO...read more

Abstract classes and interfaces are used in object-oriented programming to define common behavior and structure for classes.

• Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• Classes can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes can have constructors, while interfaces cannot.

• Example: abstract class Animal { abstract void makeSound(); } interface Flyable { void fly(); ...read more

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example of compile-time polymorphism: function overloading where multiple functions have the same name but different parameters.

• Example of runtime polymorphism: method overriding wher...read more

Inceptor in Angular is a service that allows intercepting HTTP requests and responses.

• Inceptor is used for modifying requests or responses before they are sent or received.

• It can be used for adding headers, logging, error handling, etc.

• Example: intercepting requests to add authentication token.

Dependency Injection is a design pattern in which components are given their dependencies rather than creating them internally.

• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Commonly used in frameworks like Spring in Java