Round 1 1>Delegate are Immutable? 2>Difference between Thread and Task. 3>Multicast delegate. 4>Events are Thread Safe ? 5>Which collection you will use if you want to save unique element ? 6>How HashSet<T> check uniqueness of elemnet 7>IDisposable implementation. 8>Array Vs List 8>Which panel you will use when you want to place your element digonally. 9>Explain ICommand also explain CanExecuteChange 10>Have you work on scenario where UI is getting updated frequently from different source. Second Round 1>Implement publisher subscriber model without delegate event. 2>Time complexity if you are accessing element in array and List 3>What is use of finally. 4>Have you implemented IEnumerable ? 5>Thread Safe Singleton