public void Open()
{
//xlApp.Visible = true;
//xlApp.UserControl = true;
xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Open(excelPath, 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", true, true, 0, true, 1, 0);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
}