using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Windows.Forms;
using Outlook = Microsoft.Office.Interop.Outlook;

namespace OutlookExport
{
  public partial class Form1 : Form
  {
    public Form1() {InitializeComponent();}

    private void button1_Click(object sender,EventArgs e)
    {
      DateTime vonDatum = dtpVon.Value;
      DateTime bisDatum = dtpBis.Value;
      Outlook.Application outlook = new Outlook.Application();
      Outlook.NameSpace objNamespace = outlook.GetNamespace("MAPI");
      objNamespace.Logon(null,null,true,true);
      DataSet importCalendarItems = new DataSet();
      importCalendarItems.DataSetName = "calendar";
      DataTable dt = importCalendarItems.Tables.Add("Appointment");
      string[] cols = {"Subject","Location","Start","End","AllDayEvent",
        "Duration","Organizer","Importance","Sensitivity","Body"};
      foreach (string col in cols) dt.Columns.Add(col);
      Outlook.MAPIFolder objFolder = objNamespace.GetDefaultFolder(
        Outlook.OlDefaultFolders.olFolderCalendar);
      foreach (object item in objFolder.Items)
      {
        Outlook.AppointmentItem appItem = item as Outlook.AppointmentItem;
        if (appItem == null) continue;
        DateTime itemDate = appItem.Start;
        if (appItem.Start >= vonDatum && appItem.Start <= bisDatum)
        {
          importCalendarItems.Tables[0].Rows.Add(new object[] {
            appItem.Subject, appItem.Location, appItem.Start,appItem.End,
            appItem.AllDayEvent,appItem.Duration, appItem.Organizer,
            appItem.Importance, appItem.Sensitivity, appItem.Body});
        }
      }
      dataGridView1.DataSource = dt;
    }

    private void Form1_Load(object sender,EventArgs e)
    {
      dtpVon.Value = DateTime.Now.AddDays(-30);
      dtpBis.Value = DateTime.Now;
    }
  }
}