ScriptRuntime.FlagUtil.BIT_FLAG C# (CSharp) Method

        public static uint BIT_FLAG(int num)
        {
            return ((uint)1 << (num));
        }

 public void RemoveLayer(LayerID layerID)
 {
     if (LayerID.Min <= layerID && layerID < LayerID.Max)
     {
         MarkAsUINT &= ~(FlagUtil.BIT_FLAG((int)layerID));
     }
 }