I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance of an object. What does this mean, and what can I do to fix this error?

In C#, you must create an object using new before you use any of its properties or methods. If you forget to do that or if the object becomes null at runtime, C# throws this exception.

Dec 3, 2025 · With a null reference error, there are three steps: Find what is null Find why it is null Fix it In your case, the only thing that can be null on line 36, is the o object. To verify that, right before line …

Dec 4, 2024 · How do you avoid the object reference error in C#? You can avoid it by initializing your objects and class members before using them, performing null checks prior to member access, using …

Oct 4, 2023 · In the context of your code, this error likely happens when dtgClients.SelectedItem or (dtgClients.SelectedItem as Client) is null. To fix this issue, you could add a null check to ensure that …

Sep 29, 2023 · This post will guide you on preventing the occurrence of the NullReferenceException in real-world applications.

11 hours ago · Instance 2 System.NullReferenceException: Object reference not set to an instance of an object. at …

Jul 27, 2022 · Error: System.NullReferenceException: 'Object reference not set to an instance of an object.' Doesn't make sense to me cause the statement under it is the same just a different name …

Feb 20, 2023 · NullReferenceException is thrown when we access a property or method of an uninitialized variable of a reference type. The easier way to solve this exception is to check for null …

If you try to access a member of a class instance using a null reference then you get a System.NullReferenceException. Which is the same as Object reference not set to an instance of an …