using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        String columnLetter = OfficeOpenXml.ExcelCellAddress.GetColumnLetter(53); 

        Console.WriteLine(columnLetter);

        var adress = new OfficeOpenXml.ExcelCellAddress("BA");

        Console.WriteLine(adress.Address);

        Console.WriteLine(adress.Column);

    }

}