private string AddPointToMap(IPoint point)
        {
            if (point != null && !point.IsEmpty)
            {
                var color = (IColor) new RgbColorClass()
                {
                    Green = 255
                };
                var placedPoint = ArcMapHelper.AddGraphicToMap(point, color, true, esriSimpleMarkerStyle.esriSMSDiamond, 7);
                return(placedPoint.Key);
            }

            return(string.Empty);
        }
 private void RemovePointFromMap(string pointId)
 {
     ArcMapHelper.RemoveGraphicsFromMap(new string[1] {
         pointId
     });
 }