using System;

public class Program

{

     public static void Main()

     {

​

            Program p1 = new Program();

​

            Console.WriteLine("output " + p1.GetExcelColumnName(52));

            Console.Read();

    }

​

        private string GetExcelColumnName(int columnNumber)

    {

    int dividend = columnNumber;

    string columnName = String.Empty;

    int modulo;

​

    while (dividend > 0)

    {

        modulo = (dividend - 1) % 26;

        columnName = Convert.ToChar(65 + modulo).ToString() + columnName;

        dividend = (int)((dividend - modulo) / 26);

    } 

​

    return columnName;

        }}

​

​

​