Safe with null

What you learn in this lesson

• explain what the question mark on a type says and what the compiler checks because of it
• recognize the most common null warnings by their number and fix them in the right place
• write short, safe code with ?., ?[], ??, ??= and the conditional assignment of C# 14
• declare properties so that they’re never unexpectedly empty
• use the exclamation mark only with a reason and protect public methods against null at run time