This example will prevent changing the pen of all annotation objects.

Visual Basic

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Public Sub AnnAutomation_BeforeObjectChanged(ByVal manager As AnnAutomationManager)    ' subscribe to the BeforeObjectChanged of all automations    For Each automation As AnnAutomation In manager.Automations       AddHandler automation.BeforeObjectChanged, AddressOf automation_BeforeObjectChanged    Next automation End Sub Private Sub automation_BeforeObjectChanged(ByVal sender As Object, ByVal e As AnnBeforeObjectChangedEventArgs)    ' prevent changing the pen    If e.ChangeType = AnnObjectChangedType.Pen Then       e.Cancel = True    End If End Sub

C#

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public void AnnAutomation_BeforeObjectChanged(AnnAutomationManager manager)  {    // subscribe to the BeforeObjectChanged of all automations    foreach(AnnAutomation automation in manager.Automations)       automation.BeforeObjectChanged += new EventHandler<AnnBeforeObjectChangedEventArgs>(automation_BeforeObjectChanged);  }  private void automation_BeforeObjectChanged(object sender, AnnBeforeObjectChangedEventArgs e)  {    // prevent changing the pen    if(e.ChangeType == AnnObjectChangedType.Pen)       e.Cancel = true;  }

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Reference