Create Excel AddIn using C Sharp oder VB (.NET)

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

namespace ExcelAddIn1
{
    public class MachIrgendetwas
    {
        private object missing = Type.Missing;

        public void ZahlenAuffüllen()
        {
            Excel.Application app = ExcelAddIn1.Globals.ThisAddIn.Application;
            Excel.Worksheet ws = app.ActiveSheet;
            Excel.Range rng = ws.Range["A1", missing];  
            for (int i = 1; i <= 10; i++)
            {
                rng.Value = i;
                rng = rng.Offset[1, 0];
            }
            rng = null;
            ws = null;
            app = null;
        }
    }
}

protected override Microsoft.Office.Core.IRibbonExtensibility CreateRibbonExtensibilityObject()
{
        return new Ribbon1(); //Name der Ribbon-Klasse
}

private void button1_Click(object sender, RibbonControlEventArgs e)
{
        MachIrgendetwas m = new MachIrgendetwas();
        m.ZahlenAuffüllen();
}

<?xml version="1.0" encoding="UTF-8"?> 
<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui" onLoad="Ribbon_Load"> 
  <ribbon>
    <tabs>
      <tab id="MyTab" label="Meine AddIns"> 
        <group id="MyGroup" label="Meine Gruppe"> 
          <button id="MyButton" label="Mach Etwas" onAction="MyButton_Click" /> 
        </group>
      </tab>
    </tabs>
  </ribbon>
</customUI>

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using Office = Microsoft.Office.Core;

namespace ExcelAddIn1
{
    [ComVisible(true)]
    public class Ribbon1 : Office.IRibbonExtensibility
    {
        ...

        #region Menübandrückrufe

        public void MyButton_Click(Office.IRibbonControl ctrl)
        {
            MachIrgendetwas m = new MachIrgendetwas();
            m.ZahlenAuffüllen();
        }

        ...

        #endregion

        ... 
    }
}