Returning out of void method from nested method

Question

If I have a void method I can do something like this to break out of it early

public void CheckIntNotLessThanZero(int value)
{
    if (int < 0)
    {
        return;
    }

    Console.WriteLine("Not less than zero!")
}

However I run that exact same check several times and so I want to put it into its own method so I don't repeat code:

public void CheckIntNotLessThanZero(int value)
{
    return CheckIntValue(value);

    Console.WriteLine("Not less than zero!")
}

public void CheckIntValue(int value)
{
    if (value < 0)
    {
        return;
    }
}

That's a basic example but is there a way to do this?

Answer 1

Turn your Check... methods to return bool value, and check it after every call:

public bool CheckIntValue(int value)
{
    return value < 0;
}

public void CheckIntNotLessThanZero(int value)
{
    if (CheckIntValue(value))
        return;

    Console.WriteLine("Not less than zero!")
}

Note, that you could throw exceptions in Check... methods, but you must not . To manage execution flow using exceptions is a bad practice.