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What is the difference between throw and throw ex inside a catch? What is the purpose of the finally block? 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? 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

When should you use using or await using?

Intermediate

Answer

For IDisposable/IAsyncDisposable resources — they call Dispose/DisposeAsync deterministically at the end of scope, even on exceptions, replacing manual try/finally.
await using var conn = new SqlConnection(cs);
await conn.OpenAsync();
Real-world example Guaranteeing a stream or connection is released promptly rather than waiting for GC.
All 16 Exception Handling questions