Checking and Preventing Null

We shouldn’t wrap a try/catch block around a code snippet to fix a NullReferenceException. Instead, we should check for null and defend against it. That’s the solution to the NullReferenceException.

We have learned that we get a NullReferenceException whenever we access a property or method of a null reference. We have covered two scenarios: using null as the returned value from a method and passing null as a parameter to methods. Let’s start by checking the returned value from methods to avoid a NullReferenceException.

Checking for null

Let’s revisit our example with movies to add a null check and prevent a NullReferenceException.