Advanced C# Programming Course in Chennai

Delegates are type-safe pointers to methods. They permit methods to be treated as first-class objects, allowing them to be passed as parameters or stored in variables. Events are based on delegates but provide a publisher-subscriber model, restricting the invocation of the delegate to the declaring class only, enhancing encapsulation.

An abstract class can have implemented methods and fields, allowing code reuse, while an interface only declares methods and properties without implementation. A class can inherit multiple interfaces but only one abstract class, supporting multiple inheritance via interfaces.

The .NET garbage collector automatically manages memory by tracking object references. It frees memory occupied by objects no longer in use, running in multiple generations (0, 1, 2) to optimize performance by focusing on short-lived objects first.

Extension methods allow you to add new methods to existing types without modifying their source code or creating derived types. They provide a way to extend functionality in a clean and reusable manner, especially useful when working with classes you cannot change.

LINQ (Language Integrated Query) provides the ability to query data collections—such as arrays, lists, or databases—directly within C# code using syntax similar to SQL. It improves readability, reduces errors, and unifies data querying across different data sources.

Boxing is the process of converting a value type (such as an int) into an object type by wrapping it within a reference type. Unboxing reverses this by extracting the value type from the object. Since boxing and unboxing introduce performance overhead, it’s important to minimize unnecessary conversions.

# uses structured exception handling with try, catch, finally blocks. The finally block always executes, enabling resource cleanup. C# also supports custom exceptions by inheriting from the Exception class for specialized error handling.

ref passes variables by reference, requiring initialization before use. out also passes by reference but does not require prior initialization, useful for returning multiple values. in passes by reference but enforces read-only access within the method.

Dependency Injection is a design pattern that minimizes tight coupling by supplying an object’s dependencies from outside rather than having the object create them itself. In C#, frameworks like ASP.NET Core use DI containers to inject services, improving testability, modularity, and maintainability.