Public ReadOnly Property RowViewportIndex As Integer

Dim instance As TopChangeEventArgs
Dim value As Integer
 
value = instance.RowViewportIndex

public int RowViewportIndex {get;}

private void fpSpread1_TopChange(object sender, FarPoint.Win.Spread.TopChangeEventArgs e)
{
    label1.Text = "The old top was " + e.OldTop + " and the new top is " + e.NewTop + " in viewport index " + e.RowViewportIndex;
}

Private Sub FpSpread1_TopChange(ByVal sender As Object, ByVal e As FarPoint.Win.Spread.TopChangeEventArgs) Handles FpSpread1.TopChange
    Label1.Text = "The old top was " & e.OldTop & " and the new top is " & e.NewTop & " in viewport index " & e.RowViewportIndex
End Sub