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// Variablen deklarieren 
Microsoft.Office.Interop.Excel.Application myExcelApplication;
Microsoft.Office.Interop.Excel.Workbook myExcelWorkbook;
Microsoft.Office.Interop.Excel.Worksheet myExcelWorkSheet;
myExcelApplication = null;

try
{
    // First Contact: Excel Prozess initialisieren
    myExcelApplication = new Microsoft.Office.Interop.Excel.Application();
    myExcelApplication.Visible = false;
    myExcelApplication.ScreenUpdating = true;

    // Excel Datei anlegen: Workbook
    var myCount = myExcelApplication.Workbooks.Count;
    myExcelWorkbook = (Microsoft.Office.Interop.Excel.Workbook)(myExcelApplication.Workbooks.Add(System.Reflection.Missing.Value));
    myExcelWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)myExcelWorkbook.ActiveSheet;

    // Daten eingeben 
                    
    myExcelWorkSheet.Cells[3, 4] = Properties.Settings.Default.name;
                        
    // Excel Datei abspeichern 
    // wenn die Datei vorher vorhanden ist, kommt in Excel eine Fehlermeldung. 
    myExcelWorkbook.Close(true, "Roamingtest.xls", System.Reflection.Missing.Value);
}

catch (Exception ex)
{
    String myErrorString = ex.Message;
    MessageBox.Show(myErrorString);
}
finally
{
    // Excel beenden 
    if (myExcelApplication != null)
    {
        myExcelApplication.Quit();
    }
}					

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        private void button1_Click(object sender, EventArgs e)
        {
            Excel.Application xlApp ;
            Excel.Workbook xlWorkBook ;
            Excel.Worksheet xlWorkSheet ;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Open("test.xls", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            MessageBox.Show(xlWorkSheet.get_Range("A1","A1").Value2.ToString());

            xlWorkBook.Close(true, misValue, misValue);
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);
        }