I though I would post this as after spending several hours trying to work it out I am getting nowhere. Firstly, I am fully aware that databinding in WinForms is not the best. That said it does work in most scenarios.
In my scenario, I have a binding source which is the master for my form. The object that is used for this binding source has a few simple properties and two binding lists as properties as well. Both this class, and the class type for the binding lists implement INotifyPropertyChanged. On my form, I have two DataGridViews for displaying the contents of the binding list properties.
This is also done through databinding at design time. I have two binding sources for each which use the main binding source as there data source and then the respective bindinglist properties as the data member.
So far, I would consider this to be fairly standard.
To update what is in these lists I have buttons to show a form that creates a new item, which I then add to the lists using BindingList.Add().
Now in code, if you debug, the items are in the lists, however, the grids are not updating.
But if I add a listbox to the form which uses just one of the list binding sources then both of the grids start refreshing as expected.
I apologise if any of this is unclear, I have tried to explain as best as I can with a confusing situation.
Any thoughts would be helpful as I really don't want to have to use a hidden list box.
Best Answer
This code works fine for me
with the model
Both grids get refreshed.
I hope this helps you
Edit
I changed the Form1_Load impl