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sorry this code

If (e.FieldName = "SDA") Then
If e.FieldValue = 0 Then
Dim parantRow As Node = e.Field.Start.GetAncestor(NodeType.Row)
'Remove row
parantRow.Remove()
'doc.Range.Bookmarks("SDAV").BookmarkStart.ParentNode.Remove()
End If
End If

Hi
Thanks for your inquiry. Maybe you should check whether parentRow is not null. Please try using the following code:

If (e.FieldName = "SDA") Then
If e.FieldValue = 0 Then
Dim parantRow As Node = e.Field.Start.GetAncestor(NodeType.Row)
'Remove row
If (Not parantRow Is Nothing) Then
parantRow.Remove()
End If
End If
End If

Hope this helps.
Best regards.

Thank You Very Much.