ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Layouts.Events Namespace / LayoutEventArgs Class / OldPage Property
Example Version

OldPage Property
Gets the original layout ArcGIS.Core.CIM.CIMPage
Syntax
public CIMPage OldPage {get;}
Example
LayoutEvent_PageChanged
//Report the event args when a layout page properties are changed.

//At 2.x - ArcGIS.Desktop.Layouts.Events.PageChangedEvent.Subscribe((args) =>
//{
//  System.Windows.MessageBox.Show("PageChangedEvent:" +
//  Environment.NewLine +
//  "   arg Layout: " + args.Layout.Name +
//  Environment.NewLine +
//  "   arg New CIMPage (height): " + args.NewPage.Height.ToString() +
//  Environment.NewLine +
//  "   arg Old CIMPage (height): " + args.OldPage.Height.ToString());
//});

ArcGIS.Desktop.Layouts.Events.LayoutEvent.Subscribe((args) =>
{
  var layout = args.Layout;
  if (args.Hint == LayoutEventHint.PageChanged)
  {
    var cimPage = args.OldPage;
    System.Diagnostics.Debug.WriteLine($"LayoutEvent {args.Hint.ToString()}: {layout.Name}");
  }
});
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also