General C#

Question 1

What are Generics in C# and why are they useful?

Answer 1

Generics in C# allow you to define classes, methods, interfaces, and delegates with type parameters, making them reusable and type-safe.

🔹 Why are they useful?

Eliminate Type Casting: Avoids runtime errors by enforcing type safety at compile time.

Improve Performance: Reduces boxing/unboxing for value types.

Enhance Code Reusability: A single generic class/method works with multiple data types.

Common Examples: List<T>, Dictionary<TKey, TValue>, and custom generic classes like Box<T>.</T></T>

Question 2

What are Delegates in C# and why are they useful?

Answer 2

A delegate in C# is a type that represents a method signature, allowing methods to be passed as parameters, assigned to variables, and executed dynamically.

🔹 Why are they useful?

Encapsulate Methods: Store references to methods for flexible execution.

Enable Callbacks: Useful for event-driven programming (e.g., EventHandler).

Support Functional Programming: Used in LINQ, anonymous methods, and lambda expressions.

Common Examples: Action<T>, Func<T, TResult>, Predicate<T>, and custom delegates like delegate void MyDelegate(int x).</T></T>

Question 3

What are Lambda Expressions in C# and why are they useful

Answer 3

A Lambda Expression in C# is a concise way to write anonymous functions, often used in delegates, LINQ, and functional programming.

🔹 Why are they useful?

Shorter & Readable Code: Replaces verbose anonymous methods.

Inline Function Definitions: No need for separate method declarations.

Widely Used in LINQ: Enables efficient data queries (list.Where(x => x > 10)).

Common Syntax:
Func<int, int> square = x => x * x;
Console.WriteLine(square(5)); // Output: 25