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Understand asynchronous programming and Task Parallel Library
Learn ASP.NET Core, Entity Framework, and modern .NET patterns
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LINQ and lambda expressions
Async/await and Task-based programming
Delegates, events, and observers
Entity Framework and ORM patterns
ASP.NET Core fundamentals
Dependency injection and design patterns
A: IEnumerable: in-memory collection, LINQ to Objects, operations execute client-side. IQueryable: database queries, LINQ to SQL/EF, operations translate to SQL, executed server-side. Use IQueryable for database queries (deferred execution, filters push to DB), IEnumerable for in-memory collections. Conversion: IQueryable.ToList() → IEnumerable.
A: async/await enables asynchronous programming without blocking threads. async marks method as asynchronous, await suspends execution until task completes without blocking thread. Returns Task or Task<T>. Compiler generates state machine. Use for I/O operations. Don't use async void except for event handlers.
A: Delegate: type-safe function pointer, can reference multiple methods (multicast). Event: special delegate with restricted access - only += and -= outside class, prevent external invocation. Use delegates for callbacks, events for publisher-subscriber pattern. Events add encapsulation and safety to delegates.
A: ref: parameter must be initialized before passing, can be modified. out: doesn't need initialization, must be assigned in method. in: read-only reference, prevents copying large structs. Use ref for two-way data, out for multiple return values (like TryParse), in for performance with large readonly structs.
Master LINQ queries and understand deferred vs immediate execution
Understand garbage collection and IDisposable pattern for resource management
Know dependency injection in ASP.NET Core and service lifetimes
Practice with Entity Framework Core and async database operations
Understand value types vs reference types and when to use struct vs class
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