All 16 Exception Handling questions
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What is the difference between throw and throw ex inside a catch? How does a try/catch block work in C#, and what happens if no matching catch clause exists? What does the finally block guarantee, and when is it commonly used? When should you use using or await using? What are exception filters (when) and why use them? How do custom exception classes work in C#, and what's the recommended convention for creating one? What is exception filtering using the 'when' clause, and what advantage does it offer over catching and manually re-throwing? Why does 'throw;' (bare throw) preserve the original stack trace, while 'throw ex;' does not? When should you create custom exceptions vs use built-in ones? What is the recommended strategy for exceptions in a layered/enterprise app?
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C# › Exception Handling

What is the purpose of the finally block?

Beginner

Answer

finally always runs (whether or not an exception occurred) and is used to release resources like files, connections or locks.
try { conn.Open(); ... }
finally { conn.Dispose(); }
Real-world example Ensuring a database connection is closed even if the query throws.
All 16 Exception Handling questions