Workbook and Worksheet Events | Decoding VBA

Goal

Automate guardrails with Workbook_Open, Worksheet_Change, and related events.

Example

In the Report sheet module:

Option Explicit

Private Sub Worksheet_Change(ByVal Target As Range)
    If Not Intersect(Target, Me.Range("C:C")) Is Nothing Then
        Application.EnableEvents = False
        ' Re-run lightweight validation for changed rows
        Application.EnableEvents = True
    End If
End Sub

Always toggle Application.EnableEvents when event handlers write back to the sheet to avoid infinite loops.

Next up

Optimize array vs Range access for large datasets.

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