(C#) read and write the value of A1 cell of Excel sheet

gistfile1.cs

using System;
using Microsoft.Office.Interop.Excel;

namespace COMAutomation_Excel_CS
{
    class Program
    {
        static void Main(string[] args)
        {
            string fileName = @"C:\mdb\temp2.xlsx";
            Application xlApp = new Application();
            if (xlApp != null)
            {
                xlApp.Visible = true;
                Workbook wb = xlApp.Workbooks.Open(Filename: fileName);
                ((Worksheet)wb.Sheets[1]).Select();
                Range aRange = xlApp.get_Range("A1") as Range;
                if (aRange != null)
                {
                    Console.WriteLine(aRange.Value2 ?? String.Empty);
                    aRange.Value2 = "コード レシピ Excel編";
                    Console.WriteLine(aRange.Value2);
                }
                wb.Close(true);
                xlApp.Quit();
            }
        }
    }
}