فتح ملف اكسل

public Excel.Workbook ExlWrkBook;

Excel.Application ExcApp = new Excel.Application();

ExcApp.Visible = true;

Excel.Workbook excelWorkbook = ExcApp.Workbooks.Open(File path,0, false, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", true, false, 0, false, true, true);