Each class type serves a purpose.
Use them wisely to keep your codebase clean, maintainable, and SOLID.

#CSharp #DevCommunity #CleanCode

6. Nested Classes

Class inside another class.
Can be used for tight coupling (e.g., helper classes for outer class).

5. Partial Classes

Split one class across multiple files.
Great for large codebases or designer-generated code.

4. Sealed Classes

Can’t be inherited.
Used when you want to restrict extension.

3. Static Classes

Only contains static members. Can’t be instantiated or inherited.
Perfect for utility/helper methods.

2. Abstract Classes

Use abstract when the class is meant to be inherited, not instantiated.

It can have both abstract (unimplemented) and concrete (implemented) methods.

1. Regular Classes

The most common type: public class MyClass { }
Supports inheritance, encapsulation, constructors, methods, fields.
Can be instantiated with new.

🧠 Why?
• Scalar functions run row by row = performance bottleneck
• Use inline expressions, computed columns, or TVFs (table-valued functions) for better scalability

🔹 Performance: Asynchronous iteration prevents thread blocking, keeping your app responsive.
🔹 Clean Code: No need for callbacks or complex state management like with traditional async operations.

🔹 await foreach: Asynchronously iterates over the items one by one, allowing for non-blocking execution while the data is being fetched.

Benefits:
🔹Memory Efficiency: Only one item is in memory at a time, so it’s ideal for processing large datasets or streams.

Explanation:
IAsyncEnumerable<T>: Enables you to stream data asynchronously without blocking threads.
🔹 Use yield return to return items one at a time.
🔹 Data is fetched lazily, so you only process what you need.