Confused about behavior of ?. operator

Question

Here is my code

class Address
{
    public bool IsAppartment { get; set; }
}

class Employee
{
    public string Name { get; set; }
    public Address Addres         


        

Answer 1

UPDATE What will be equivalent code for following using short cut operators?
if (employee.Address != null && ? employee.Address.IsAppartment == true)

if (employee?.Address?.IsAppartment == true)

Answer 2

This is correct, the rest of the chain doesn't execute, null-coalescing operator ?? returns true. According to MSDN

The null-coalescing operator ?? returns the value of its left-hand operand if it isn't null; otherwise, it evaluates the right-hand operand and returns its result.

If you want to compare the result with either true or false (per your update) you can use

if (employee?.Address?.IsAppartment == true)
{
}

The left-hand operand returns Nullable<bool>, you can also read about it in MSDN