// sets only the Guide snapping mode
ArcGIS.Desktop.Layouts.LayoutSnapping.SetSnapModes(new[] { LayoutSnapMode.Guide });
// sets only Element and Page snapping modes
ArcGIS.Desktop.Layouts.LayoutSnapping.SetSnapModes(new[] { LayoutSnapMode.Element, LayoutSnapMode.Page });
// clear all snap modes
ArcGIS.Desktop.Layouts.LayoutSnapping.SetSnapModes(null);
// set snap modes one at a time
ArcGIS.Desktop.Layouts.LayoutSnapping.SetSnapMode(LayoutSnapMode.Margins, true);
ArcGIS.Desktop.Layouts.LayoutSnapping.SetSnapMode(LayoutSnapMode.Guide, true);
/// LayoutSnapping.SetSnapModes(new[]{ LayoutSnapMode.Guide }); // sets only the Guide snapping mode
// get current snap modes
var snapModes = ArcGIS.Desktop.Layouts.LayoutSnapping.SnapModes;
// get state of a specific snap mode
bool isOn = ArcGIS.Desktop.Layouts.LayoutSnapping.GetSnapMode(LayoutSnapMode.Guide);