public ExcelWorksheet()
{
excelApp.Visible = true;
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
excelWorkBook = excelApp.ActiveWorkbook;
if (excelWorkBook == null)
excelWorkBook = (Excel._Workbook) excelApp.Workbooks.Add(Missing.Value);
excelSheet = (Excel._Worksheet) excelWorkBook.ActiveSheet;
excelSheet.Name = "SpaceClaim";
}