Producer–Consumer using BlockingCollection?

Short answer: BlockingCollection<int> queue = new BlockingCollection<int>(); Task.Run(() => { for(int i = 1; i <= 5; i++) { queue.Add(i); } queue.CompleteAdding(); }); Task.Run(() => { foreach(var item in queue.GetConsumingEnumerable()) { Console.WriteLine("Consumed " + item); } }); Provides automatic thread synchronization and prevents race conditions.

Example code

BlockingCollection<int> queue = new BlockingCollection<int>(); Task.Run(() => {
for(int i = 1; i <= 5; i++)
{ queue.Add(i); } queue.CompleteAdding(); }); Task.Run(() => {
foreach(var item in queue.GetConsumingEnumerable())
{ Console.WriteLine("Consumed " + item); } }); Provides automatic thread synchronization and prevents race conditions.

Real-world example (ShopNest)

Answer with: definition → one ShopNest-style story → trade-off → how you would verify it in production.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.