C# - implementing Memory Leak When Using Event Handlers in a WinForms Application
I'm having a hard time understanding I've tried everything I can think of but I'm trying to debug I've searched everywhere and can't find a clear answer. I'm trying to figure out I need some guidance on I'm currently working with a memory leak scenario in my WinForms application where I subscribe to events from a library component but never seem to be able to unsubscribe properly. I have a form that subscribes to a `DataReceived` event from an external data source, but even after closing the form, the application does not release the memory associated with it. I suspect that the event handlers might be keeping the form alive even after it's disposed. Here’s a simplified version of what my code looks like: ```csharp public partial class MainForm : Form { private ExternalDataSource _dataSource; public MainForm() { InitializeComponent(); _dataSource = new ExternalDataSource(); _dataSource.DataReceived += OnDataReceived; } private void OnDataReceived(object sender, DataEventArgs e) { // Handle data } protected override void OnFormClosing(FormClosingEventArgs e) { // Attempt to unsubscribe from the event _dataSource.DataReceived -= OnDataReceived; base.OnFormClosing(e); } } ``` In my testing, I verified that the `OnFormClosing` method is indeed getting called, and the unsubscribe line executes, but I still notice that the memory usage of the application keeps increasing until it eventually crashes. I tried forcing garbage collection using `GC.Collect()` after unsubscribing, but that hasn't resolved the question either. I'm using .NET Framework 4.8 and the external data source is interfacing with a library that continuously sends data. Is there a best practice for managing event subscriptions in WinForms, or any common pitfalls that could lead to this kind of memory leak? Any insights would be greatly appreciated! This is happening in both development and production on macOS. What's the correct way to implement this? I'm on Ubuntu 22.04 using the latest version of C#. I'd be grateful for any help. I'm coming from a different tech stack and learning C#. Any feedback is welcome! This issue appeared after updating to C# 3.9. How would you solve this? This issue appeared after updating to C# 3.11. Is this even possible? I'm working on a REST API that needs to handle this. I'd really appreciate any guidance on this.