How can I check the current row's values before the Binding Navigator
commits changes to the underlying list (datatable, actually).

Hi,

Set the bindingnavigators movenextitem, movefirstitem,
movepreviousitem, and movelastitem action to none. Then you can handle the
event in code.

Private Sub BindingNavigatorMoveNextItem_Click(ByVal sender As Object,
ByVal e As System.EventArgs) Handles BindingNavigatorMoveNextItem.Click
Dim bIsValidData As Boolean = False ' Check if your data is valid
If bIsValidData Then
ComputerBindingSource.MoveNext()
Else
MessageBox.Show("Bad Data")
End If
End Sub

Ken
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thanks!