Exceptions

There's always a chance something goes wrong in a program — a missing file, a network failure, a bad array index, invalid user input, you name it. Exception handling lets you handle errors safely so the whole app doesn't crash.

try
{
    int[] numbers = { 1, 2, 3 };
    Console.WriteLine(numbers[10]);
}
catch (IndexOutOfRangeException)
{
    Console.WriteLine("Index is outside the array range.");
}
catch (Exception ex)
{
    Console.WriteLine("Something went wrong.");
    Console.WriteLine(ex.Message);
}
finally
{
    Console.WriteLine("Finished checking the array.");
}

try, catch, finally

• try block holds the code that might throw an error.
• catch handles the error when one occurs. It's best to catch specific exceptions first.
• finally runs whether an error happened or not — handy for cleaning up resources.

Index is outside the array range. Finished checking the array.