using System;

public class Program

{

    // The problem: If text is null, this method returns True. I expected False.

    // I had hoped it would short-circuit as soon as null is detected and evaluate the entire expression as false.

    static bool TextContainsWrong(string text)

    {

        return text?.IndexOf('A') != -1;

    }

    // Here's what the generated code expands out to:

    static bool TextContainsWrongEquivalent(string text)

    {

        return text == null || text.IndexOf('A') != -1;

    }

    // The correct code should be written explicitly like this:

    static bool TextContainsCorrect(string text)

    {

        return text != null && text.IndexOf('A') != -1;

    }   

    public static void Main()

    {

        Console.WriteLine(TextContainsWrong(null));

        Console.WriteLine(TextContainsWrongEquivalent(null));

        Console.WriteLine(TextContainsCorrect(null));

    }

}