ExcelDna.Integration.ExcelReference.AddReference C# (CSharp) Method

        public void AddReference(int rowFirst, int rowLast, int columnFirst, int columnLast)
        {
            if (rectangles.Count < ushort.MaxValue)
                rectangles.Add(new ExcelRectangle(rowFirst, rowLast, columnFirst, columnLast));
            else
                throw new OverflowException("Maximum number of references exceeded");
        }

 public override void AddReference(int rowFirst, int rowLast, int columnFirst, int columnLast)
 {
     excelReference.AddReference(rowFirst, rowLast, columnFirst, columnLast);
 }