C#
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  1. What is the difference between List and IList in C#?

  2. What is an Optional parameter in C#?

  3. How to make a method deprecated in C#?

  4. What is the difference between Foreach and Parallel.Foreach in C#?

  5. What are named parameters in C#?

  6. How to update the value stored in a Dictionary in C#?

  7. How to create Guid value in C#?

  8. What is Binary Serialization and Deserialization in C# and how to achieve Binary Serialization in C#?

  9. What is the difference between IEnumerable and IQueryable in C#?

  10. What is bin and obj folder in C#?

  11. What is #if DEBUG and How to use it in C#?

  12. How to subscribe to an Event in C# and can we have multiple subscribers to one Event in a C#?

  13. How to use order by, group by in c#?

  14. What is the implicit implementation of the interface and when to use implicit implementation of the interface in C#?

  15. What is the difference between an EXE and a DLL and how is it getting generated?

  16. What is the difference between Static class and Singleton instance in C#?

  17. How to implement a Singleton design pattern in C#?

  18. What is typeof, GetType or is in C#?

  19. What does the [Flags] Enum Attribute mean in C#?

  20. How do you do a deep copy of an object in .NET?
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