How to disable "snap to grid" from jQuery UI draggable?

How to disable "snap to grid" from jQuery UI draggable?

Anyone know how we can disable "Snap to Grid" from jQuery UI Draggable
base on checkbox.
I m using below code to enable snap to grid dynamically.
$(".WidgetCl").draggable({containment: '#editorWindow',scroll: true, snap:
".gridCol", snapMode: "both", stop :function()
{$(this).trigger("stopdrag");}})
$(".WidgetCl").draggable("option", "grid", [ gridSize,
gridSize ]);
Thanks, Sonal