Working with collections and LINQWhat are the key differences between the “IEnumerable” and “ICollection” interfaces? When is it optimal to use each?How does the “deferred execution” principle work in LINQ, and how does it impact performance?What are the primary differences between the “Where” and “Select” LINQ methods, and when is it best to use each?What are the differences between the “All” and “Any” LINQ methods, and how do they behave when applied to an empty collection?What distinguishes “FirstOrDefault” from “SingleOrDefault”, and when do these methods return “null”?What are the primary collection types in .NET you consider, and what are their key differences?What are the differences between “List<T>” and “Dictionary<TKey”, “TValue>”?How can you optimize the execution of LINQ queries when dealing with large datasets?What are the key differences between the “IEnumerable” and “IQueryable” interfaces? Explain their implementation and usage scenarios.What’s the key difference between an array and “List<T>” in C#? When is it optimal to use each of these structures?In which scenarios should one prefer “HashSet<T>” over “List<T>”?What is the key distinction between “LinkedList<T>” and “List<T>” in C#? In which scenarios is it optimal to use “LinkedList<T>”?What does “Dictionary<TKey, TValue>” represent in C#, and what are typical scenarios for its use?What are immutable collections in C#? What are their advantages and disadvantages?Exception handling and debuggingWhat’s the difference between using “throw” and “throw ex” inside a “catch” block?What are the primary types of exceptions in C# and under what conditions do they typically arise?What does the “finally” block do in a “try-catch” structure, and are there scenarios where it might not execute?What is an “inner exception”, and how can it be used to improve debugging?What is a “stack trace”, and how can it be beneficial in tracing exceptions?What is the essence of a “conditional breakpoint” in Visual Studio, and when is it beneficial to use?How can we handle or avoid an “unhandled exception”?What is the difference between “Debug” and “Release” configurations?How can one deliberately trigger an exception?What’s the distinction between using “Assert” and “Throw” in unit test development and debugging?How should one handle exceptions in “Task”? What’s the difference between “async void” and “async Task” in the context of error handling?Asynchronous programming with async and awaitWhat is the purpose of the “async” and “await” keywords in C#?What’s the main difference between multithreading and asynchronous programming?What does an “async” method return?What pitfalls can arise from the careless use of “async” and “await”?What is a “deadlock” in the context of asynchronous programming, and how can it be avoided?How does asynchrony impact the call stack?What’s the difference between “Task”, “Task<T>”, and “ValueTask<T>”?How can multiple asynchronous operations be executed concurrently and awaited for their completion?What issues might arise when using asynchronous methods in class constructors or finalizers?How are exceptions handled in asynchronous methods?What is “synchronization context” in asynchronous programming, and what is its significance?How does “ConfigureAwait” work, and why is there a recommendation to use “ConfigureAwait(false)”?What is “task continuation”, and how is it used?How do asynchronous methods interact with threads?What is “TaskCompletionSource” in the context of asynchronous operations?What is a “cancellation token”, and how is it used?What’s the difference between “Parallel” from TPL and “async/await”?What are Parallel loops in TPL, and how to control them?How to use Parallel.ForEachAsync, and what is the difference between it and Parallel.ForEach?When is it appropriate to call an asynchronous function without using await, and how does this affect execution?What are “asynchronous streams” in C# 8.0, and how can “IAsyncEnumerable” transform real-time data processing?How can you use “SemaphoreSlim” for asynchronous synchronization of resource access?What is “asynchronous disposal” in C# 8.0 with the use of “IAsyncDisposable”?Delegates, events, and lambda expressionsWhat are “event accessors” in C#, and how can they customize subscription or unsubscription logic?How does .NET implement lambda expressions at the compilation level? Do they become actual methods of a class?What are the primary differences between lambda expressions and expression trees, and what opportunities does working with expression trees provide?Why can “multicast delegates” be problematic in modern applications, and what alternatives exist?How can one dynamically create functions based on lambda expressions at runtime?What is understood by “closure” in the context of lambda expressions and anonymous methods, and how does it affect captured variables?What can be the consequences if one of the event subscribers throws an exception during the event invocation? How does it impact other subscribers of that event, and what approaches can be employed for the graceful handling of such scenarios?What’s the difference between delegates and events, and how do they interoperate?How can lambda expressions be used in C#, and what are their advantages over delegates?What is the difference between “Func<T>”, “Action<T>”, and “Predicate<T>” in C#, and when should each be used?What challenges might arise when working with events, and how can they be mitigated?How to use generic classes, methods, and interfaces to create reusable codeWhat is the purpose of generics in C#, and what advantages do they offer over using the “object” base type?How do you define a generic class, and how does it differ from a standard class? How can you set constraints on generic type parameters?Can generics integrate with other key features of C# such as delegates or attributes?How are covariance and contravariance applied to generic interfaces and delegates in C#?What are the characteristics of static fields and methods in generic classes compared to standard classes?What does a “generic type extension method” mean, and how is it applied?Can we inherit from generic type classes? What are the nuances of this process?What compilation mechanism is used for generic types? Is separate machine code generated for each specialized type?Multithreading – Creating and managing threads, synchronization primitives, and handling thread synchronization and communicationHow can one create a thread in C#, and what are the primary methods for its initiation?What synchronization primitives are available in C# for managing resource access?What’s the difference between Monitor, Mutex, and Semaphore when it comes to thread synchronization?What is a “deadlock” in multithreading, and how can it be avoided?How can “ThreadPool” help manage threads more efficiently than manually creating threads?What does “Task” represent in C#, and how does it differ from a regular thread?How can you ensure safe data exchange between threads?How do “async” and “await”help create asynchronous code without directly managing threads?What is “thread-local storage” in C#, and how is it used?What are the main approaches and best practices recommended when working with multithreading in C#?What is the role of “memory barriers” or “fences” in multithreaded C# code?When is it most effective to apply “SpinLock”?What is the purpose of the “volatile” keyword in multithreaded C# code, and how does it interact with compiler optimization?What are the primary distinctions between the “BlockingCollection”, “ConcurrentBag”, “ConcurrentQueue”, and “ConcurrentStack”collections?What is the purpose of “ThreadLocal<T>”, and what are its advantages and drawbacks?What does “starvation” mean in the context of multithreaded programming?How does “CancellationToken” assist in managing the execution of threads and tasks?How do atomic operations, such as the methods in the “Interlocked class”, facilitate synchronization in multithreaded code?What is meant by non-blocking calls in multithreaded programming, and why are they considered advantageous compared to blocking calls?Why does the traditional “lock” mechanism not work for asynchronous operations?How can synchronization be ensured in asynchronous methods? What primitives can be used for this purpose?How does “Task.Yield()” interact with the task scheduler, and what is its use?How does C#’s memory model impact multithreading, and what key features of this model are important to understand?Garbage collectionWhat is the primary difference between the stack and heap in the context of memory management and garbage collection in C#?How does .NET recognize that an object has no active references and is ready for garbage collection?Why are generations in garbage collection important, and how do they function?What is the difference between the “Finalize” and “Dispose” methods in memory management?How can you signal to the GC about the need for a garbage collection?What does “memory leak” mean in .NET, and how can garbage collection assist in detecting it?How can weak references help prevent objects from being locked by the GC?What is the purpose of the “GC.KeepAlive()”method, and when should it be used?How do GC modes of operation (for example, workstation and server) influence its activity?What’s the difference between the Large Object Heap and the regular heap, and how does it impact garbage collection?What impact do pinned objects have on the operation of the GC, and what is the Pinned Object Heap?How does the presence of finalizers in objects impact the garbage collection process?How does the GC handle objects that are frequently created and destroyed (for instance, in a loop)?How does the usage of unmanaged resources impact the GC, and how can one ensure their proper disposal?SummaryAdditional reading
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