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Gets or sets the LayoutChangeBase object defining the change of page layout that will occur before the current object.
public LayoutChangeBase LayoutChangeBefore { get; set; }
<xref href="C1.C1Preview.LayoutChangeBase" data-throw-if-not-resolved="false"></xref> is an abstract class.
Instances of the following non-abstract classes derived from it can be assigned to this property: