Exception Handling

Unlike Java, C# has no checked exceptions — every exception is effectively "unchecked," and the compiler never forces a method to declare or catch one.

try {
    int result = 10 / int.Parse("0");
} catch (DivideByZeroException e) {
    Console.WriteLine($"Can't divide by zero: {e.Message}");
} finally {
    Console.WriteLine("This always runs");
}

using (a statement, distinct from the using import directive) is C#'s RAII-flavored resource cleanup, guaranteeing Dispose() is called even if an exception is thrown:

using (var reader = new StreamReader("data.txt")) {
    Console.WriteLine(reader.ReadToEnd());
} // reader.Dispose() called automatically here

Common mistakes

• Catching Exception broadly "to be safe" — exactly the same anti-pattern flagged in Java: catch the specific type you actually expect and know how to handle.

Practice

Write code that attempts int.Parse("abc"), catching FormatException and printing a friendly message.

try {
    int n = int.Parse("abc");
} catch (FormatException) {
    Console.WriteLine("That wasn't a valid number");
}