public class EditingOptions 

//toggle, switch option values
var options = ApplicationOptions.EditingOptions;

options.EnforceAttributeValidation = !options.EnforceAttributeValidation;
options.WarnOnSubtypeChange = !options.WarnOnSubtypeChange;
options.InitializeDefaultValuesOnSubtypeChange = !options.InitializeDefaultValuesOnSubtypeChange;
options.UncommitedAttributeEdits = (options.UncommitedAttributeEdits == 
  UncommitedEditMode.AlwaysPrompt) ? UncommitedEditMode.Apply : UncommitedEditMode.AlwaysPrompt;

options.StretchGeometry = !options.StretchGeometry;
options.StretchTopology = !options.StretchTopology;
options.UncommitedGeometryEdits = (options.UncommitedGeometryEdits == 
  UncommitedEditMode.AlwaysPrompt) ? UncommitedEditMode.Apply : UncommitedEditMode.AlwaysPrompt;

options.ActivateMoveAfterPaste = !options.ActivateMoveAfterPaste;
options.ShowFeatureSketchSymbology = !options.ShowFeatureSketchSymbology;
options.FinishSketchOnDoubleClick = !options.FinishSketchOnDoubleClick;
options.AllowVertexEditingWhileSketching = !options.AllowVertexEditingWhileSketching;
options.ShowDeleteDialog = !options.ShowDeleteDialog;
options.EnableStereoEscape = !options.EnableStereoEscape;
options.DragSketch = !options.DragSketch;
options.ShowDynamicConstraints = !options.ShowDynamicConstraints;
options.IsDeflectionDefaultDirectionConstraint = 
  !options.IsDeflectionDefaultDirectionConstraint;
options.IsDirectionDefaultInputConstraint = !options.IsDirectionDefaultInputConstraint;
options.ShowEditingToolbar = !options.ShowEditingToolbar;
options.ToolbarPosition = (options.ToolbarPosition == ToolbarPosition.Bottom) ? 
          ToolbarPosition.Right : ToolbarPosition.Bottom;
options.ToolbarSize = (options.ToolbarSize == ToolbarSize.Medium) ? 
          ToolbarSize.Small : ToolbarSize.Medium;
options.MagnifyToolbar = !options.MagnifyToolbar;

options.EnableEditingFromEditTab = !options.EnableEditingFromEditTab;
options.AutomaticallySaveEdits = !options.AutomaticallySaveEdits;
options.AutoSaveByTime = !options.AutoSaveByTime;
options.SaveEditsInterval = (options.AutomaticallySaveEdits) ? 20 : 10;
options.SaveEditsOperations = (options.AutomaticallySaveEdits) ? 60 : 30;
options.SaveEditsOnProjectSave = !options.SaveEditsOnProjectSave;
options.ShowSaveEditsDialog = !options.ShowSaveEditsDialog;
options.ShowDiscardEditsDialog = !options.ShowDiscardEditsDialog;
options.DeactivateToolOnSaveOrDiscard = !options.DeactivateToolOnSaveOrDiscard;
options.NewLayersEditable = !options.NewLayersEditable;

var options = ApplicationOptions.EditingOptions;

//Must use QueuedTask
QueuedTask.Run(() =>
{
  //There are 4 vertex symbol settings - selected, unselected and the
  //current vertex selected and unselected.
  var reg_select = options.GetVertexSymbolOptions(VertexSymbolType.RegularSelected);
  var reg_unsel = options.GetVertexSymbolOptions(VertexSymbolType.RegularUnselected);
  var curr_sel = options.GetVertexSymbolOptions(VertexSymbolType.CurrentSelected);
  var curr_unsel = options.GetVertexSymbolOptions(VertexSymbolType.CurrentUnselected);

  //to convert the options to a symbol use
  //GetPointSymbol
  var reg_sel_pt_symbol = reg_select.GetPointSymbol();
  //ditto for reg_unsel, curr_sel, curr_unsel
});