public static List<SnapMode> SnapModes {get; set;}

// set only Point and Edge snapping modes, clear everything else
Snapping.SetSnapModes(
  new List<SnapMode>() { SnapMode.Point, SnapMode.Edge });

// clear all snap modes
Snapping.SetSnapModes(null);

// set snap modes one at a time
Snapping.SetSnapMode(SnapMode.Edge, true);
Snapping.SetSnapMode(SnapMode.End, true);
Snapping.SetSnapMode(SnapMode.Intersection, true);

// get current snap modes
var snapModes = Snapping.SnapModes;

// get state of a specific snap mode
bool isOn = Snapping.GetSnapMode(SnapMode.Vertex);