'宣言 Protected Overridable Sub OnDocumentStarting()
'使用法 Dim instance As C1PrintDocument instance.OnDocumentStarting()
protected virtual void OnDocumentStarting()
'宣言 Protected Overridable Sub OnDocumentStarting()
'使用法 Dim instance As C1PrintDocument instance.OnDocumentStarting()
protected virtual void OnDocumentStarting()