.NET and C# interview questions

GC reclaims managed objects no longer referenced.

var still has a compile-time type

An interface defines a contract of members a type must implement.

It lets a method accept a variable number of arguments as an array.

The built-in container registers services with lifetimes: transient, scoped, singleton.

Enums give named integer constants for a closed set of values.

Middleware forms a pipeline that handles each HTTP request: logging, auth, routing, endpoints.

throw keeps the original stack trace when rethrowing.

EF Core is an ORM that maps C# classes to tables and generates SQL.

List grows dynamically and has helpful methods.

Any can stop at the first match.

It overrides base appsettings for the Development environment.

It redirects HTTP requests to HTTPS.

Both persist tracked changes

Constructor injection makes required dependencies obvious and testable.

They wrap the whole file in a namespace without nested braces.

It declares constructor parameters on the type itself and can capture them as fields.

required forces object initializers or constructors to set those properties.

It provides atomic increments and compare-exchange without a full lock.

Task.Run is the modern short form for offloading to the thread pool.