INotifyPropertyChanged works fine with a DataGridView, but not with a single databound textbox. Why ?

[David Mujica]

I've created a class which Implements the INotifyPropertyChanged event and raises that event when a data member in the class is changed. On my form, (form3), I have: 1) BindingSource 2) BingingSourceNavigator 3) DatagridView 4) Textbox boound to the "LastName" datamember of the BadgeHolder class 5) A button which sets the first occurrence of LastName in the BindingSource Datasource to "Smith" When I click the button, the DataGridView is automatically updated with the value of Smith. Cool ! Why doesn't the Textbox get the update ? If I move to the next record using the BindingSourceNavigator button, then I navigate back to the first record, the Textbox has the value of "Smith". Which is correct. Why doesn't the Textbox automatically update like the DataGridView since they are both connected to the same BindingSource ? :confused: Thanks.

Public Class BadgeHolder

Implements INotifyPropertyChanged

Public Event PropertyChanged As PropertyChangedEventHandler \_
   Implements INotifyPropertyChanged.PropertyChanged

{blah, blah more class stuff ...}

Public Class FORM3

Private Sub FORM3\_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Me.BadgeHolderBindingSource.DataSource = BadgeHolder.FILL
    Me.DataGridView1.DataSource = Me.BadgeHolderBindingSource

    Me.TextBox1.DataBindings.Add("Text", Me.BadgeHolderBindingSource.DataSource, "LastName", False, \_
        DataSourceUpdateMode.OnPropertyChanged)

End Sub

Private Sub Button1\_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim BHList As BindingList(Of BadgeHolder) = \_
        CType(BadgeHolderBindingSource.DataSource, BindingList(Of BadgeHolder))

    BHList(0).LastName = "Smith"

End Sub

End Class