WinForms: ComboBox SelectedIndexChanged Not Firing After Binding Update
I recently switched to I'm experiencing an scenario where the `SelectedIndexChanged` event of a `ComboBox` in my WinForms application does not fire after I update the data source. I'm using .NET Framework 4.8 and my data source is a `BindingList<MyObject>`, which is bound to the `ComboBox` through `DataSource`. I've ensured that the `ComboBox` is properly initialized and populated, but after changing the underlying list (adding/removing items), the event does not trigger as expected. Here's a simplified version of my code: ```csharp public partial class MyForm : Form { private BindingList<MyObject> myList; public MyForm() { InitializeComponent(); myList = new BindingList<MyObject>(); comboBox1.DataSource = myList; comboBox1.DisplayMember = "Name"; comboBox1.ValueMember = "Id"; comboBox1.SelectedIndexChanged += ComboBox1_SelectedIndexChanged; } private void ComboBox1_SelectedIndexChanged(object sender, EventArgs e) { MessageBox.Show("Selected Index: " + comboBox1.SelectedIndex); } private void UpdateList() { myList.Add(new MyObject { Id = 1, Name = "Item 1" }); myList.Add(new MyObject { Id = 2, Name = "Item 2" }); // Clear and re-add items to simulate data refresh myList.Clear(); myList.Add(new MyObject { Id = 3, Name = "Item 3" }); } } ``` I've called `UpdateList()` after the initial binding, and although the items in the dropdown change, the `SelectedIndexChanged` event does not fire when I select a different item. I also noticed that if I set the `DataSource` to `null` and then reassign it after updating the list, the event works as expected, but this feels like a workaround. Is there a better approach to ensure the `SelectedIndexChanged` event fires consistently without needing to reassign the `DataSource`? Any insights into what I might be doing wrong would be greatly appreciated! Thanks in advance! I'm open to any suggestions. This is happening in both development and production on Windows 11. Any ideas what could be causing this?