static public int OnBeginDrag(IntPtr l)
 {
     try {
         UnityEngine.UI.Slider self = (UnityEngine.UI.Slider)checkSelf(l);
         UnityEngine.EventSystems.PointerEventData a1;
         checkType(l, 2, out a1);
         self.OnBeginDrag(a1);
         pushValue(l, true);
         return(1);
     }
     catch (Exception e) {
         return(error(l, e));
     }
 }