They hold a reference that points to where the object lives in memory. ![]() Reference types variables, on the other hand, don’t hold the value itself. If you have a variable of a value type, it stores the value itself. ![]() NET, you can divide data types in two categories: value types and reference types. But what is a null reference? In what way does it differ from a non-null reference? We already know that the NullReferenceException is caused by a null reference. At this point, you’re halfway there to seeing the whole picture.Īfter this round of theoretical definitions, we’ll get to more practical matters, teaching you how to avoid the NullReferenceException in practice. After that, you’ll learn what null references are. We’ll start with fundamentals, by giving a brief explanation of what references are in C#/.NET. This exception is thrown when you try to access a member-for instance, a method or a property-on a variable that currently holds a null reference.īut what is a null reference? What are “references” in the first place? How can you stop the NullReferenceException from happening in your code? That’s what we’re going to cover in today’s post. This infamous and dreaded error message happens when you get a NullReferenceException. ![]() “Object Reference Not Set to an instance of an object.” Cast the first stone those who never struggled with this error message when they were a beginner C#/.NET programmer.
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