Try-catch execution flow in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of try-catch with exception thrown

What is the output of this C# code?

C Sharp (C#)

try {
    Console.WriteLine("Start");
    throw new Exception("Error");
    Console.WriteLine("End");
} catch (Exception ex) {
    Console.WriteLine("Caught: " + ex.Message);
}
Console.WriteLine("After try-catch");

A Start\nCaught: Error\nAfter try-catch

B Start\nEnd\nCaught: Error\nAfter try-catch

C Caught: Error\nAfter try-catch

D Start\nAfter try-catch

💡 Hint

Remember that code after the throw inside try is skipped.

The code prints "Start", then throws an exception. The line "End" is skipped. The catch block prints the exception message. Finally, the line after try-catch runs.

❓ Predict Output

intermediate

Output when no exception is thrown

What will this C# code print?

C Sharp (C#)

try {
    Console.WriteLine("Try block");
} catch {
    Console.WriteLine("Catch block");
} finally {
    Console.WriteLine("Finally block");
}

A Catch block\nFinally block

B Try block\nFinally block

C Try block\nCatch block\nFinally block

D Finally block

💡 Hint

No exception means catch block is skipped.

Since no exception occurs, the catch block is skipped. The finally block always runs.

❓ Predict Output

advanced

Exception in finally block

What is the output of this code?

C Sharp (C#)

try {
    Console.WriteLine("In try");
    throw new Exception("Try exception");
} catch (Exception ex) {
    Console.WriteLine("In catch: " + ex.Message);
} finally {
    Console.WriteLine("In finally");
    throw new Exception("Finally exception");
}
Console.WriteLine("After try-catch-finally");

A In try\nIn finally\nUnhandled exception: Finally exception

B In try\nIn catch: Try exception\nIn finally\nAfter try-catch-finally

C In try\nIn catch: Try exception\nIn finally\nUnhandled exception: Finally exception

D In try\nIn catch: Try exception\nAfter try-catch-finally

💡 Hint

Exception in finally overrides previous exception.

The try throws an exception caught by catch. Finally runs and throws a new exception, which is unhandled and stops execution.

❓ Predict Output

advanced

Return value with try-catch-finally

What value does this method return?

C Sharp (C#)

int Test() {
    try {
        return 1;
    } catch {
        return 2;
    } finally {
        return 3;
    }
}
Console.WriteLine(Test());

A 3

B 2

C 1

D 0

💡 Hint

Finally return overrides other returns.

The finally block's return overrides the try's return, so the method returns 3.

🧠 Conceptual

expert

Exception propagation with nested try-catch

Consider this code snippet. Which statement is true about the output?

C Sharp (C#)

try {
    try {
        throw new InvalidOperationException("Inner");
    } catch (ArgumentException) {
        Console.WriteLine("Caught ArgumentException");
    }
} catch (Exception ex) {
    Console.WriteLine("Caught Exception: " + ex.Message);
}

A Caught ArgumentException

B Caught Exception: ArgumentException

C No output, program crashes

D Caught Exception: Inner

💡 Hint

Inner catch only handles ArgumentException, not InvalidOperationException.

The inner catch does not catch InvalidOperationException, so it propagates to outer catch which prints the message.