Adding a new entity to a bound DataGridView

Question

I have Companies and Contracts in a parent-child relationship, shown in two DataGridViews in a winforms app. They are both bound to collections of Entity models.

How can I add a new contract?

1. If I do this,

    Dim c as Company = CompaniesBindingSource.Current c.contracts.Add(New Contract()) context.SaveChanges() 

   the grid doesn't refresh (even if I call .Refresh() , or .ResetBindings() on the BindingSource. I have to navigate away from the selected company and back to it, for the grid to refresh.

2. If I do ContractsBindingSource.AddNew() , the grid refreshes, but the data doesn't persist to my entity context.

Note: my contracts collection is a property on my Company model:

Public ReadOnly Property activeContracts As SortableBindingList(Of Contract)
    Get
        Dim list = New SortableBindingList(Of Contract)

        For Each contract As Contract In contracts.Where(Function(c) c.isActive).ToList
            list.Add(contract)
        Next

        Return list
    End Get
End Property

Does this have anything to do with it? How can I force a property to recompute?

Answer 1

This worked for me:

CompaniesBindingSource.ResetCurrentItem()

This recalculated the Contracts property, and automatically refreshed the contracts grid.