C# null check chain in method call

Question

I suppose method call chain below.

void DoSomething()
{
    ObjectA a = CreateA();
    if (a != null)
    {
        a.Foo();
    }
}

ObjectA CreateA()
{
            


        

Answer 1

You can do

void DoSomething()
{
    CreateA()?.Foo();
}

ObjectA CreateA()
{
    return CreateB()?.ToA();
}

Your other approach if you can't use C# 6, is don't return nulls, use null objects that way you never have to deal with null checking ( but you can still check if something is the null object )