Top 10 C# Interview questions

A modern, object-oriented programming language developed by Microsoft. It is widely used for developing a variety of applications on the .NET framework.

• type safety
• garbage collection
• strong typing
• component-oriented programming
• automatic memory management
• multi-threading support

• Value types store their values directly
• Reference types store references to their values.

Value types are typically stored on the stack.

Reference types are stored on the heap.

The "const" keyword is used to declare a compile-time constant that cannot be changed.

The "readonly" keyword is used to declare a value that can only be assigned at runtime or in a constructor and remains constant throughout the lifetime of the object.

The "ref" keyword is used to pass a variable by reference, allowing the called method to modify its value. Also must be initialized prior to use.

The "out" keyword is similar to "ref," but it is used when the called method intends to assign a value to the parameter.

Used to automatically release resources such as file handles or database connections when they are no longer needed. It ensures that the objects are properly disposed of even if an exception occurs.

A fundamental feature of object-oriented programming. It allows a class to inherit the properties and behavior of another class. The derived class (subclass) can extend or override the functionality of the base class (superclass).

Type-safe function pointers. They are used to define and pass methods as parameters, enabling callback mechanisms and event handling. Delegates allow for loose coupling and are a key component of C# events.

Used to specify code that will always be executed, regardless of whether an exception is thrown or caught. It is typically used to release resources or perform cleanup operations.

The "async" and "await" keywords are used to write asynchronous code in a more readable and maintainable manner.

"async" is used to define an asynchronous method.

"await" is used to await the completion of an asynchronous task, allowing the code to continue executing without blocking.