private void PasswordExcel(string path,string pass,string name)
    {
        try
        {
            System.Globalization.CultureInfo oldCI = System.Threading.Thread.CurrentThread.CurrentCulture;
            System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
            object misValue = System.Reflection.Missing.Value;
            var xlApp = new Excel.Application();// ApplicationClass();
            var xlWorkBook = xlApp.Workbooks.Add(misValue);
            // Excel.Application xlApp;
            //Excel.Workbook xlWorkBook;
            try
            {
                xlApp = new Excel.ApplicationClass();
                xlWorkBook = xlApp.Workbooks.Open(path, true);
                xlWorkBook.Password = pass;
                xlWorkBook.Save();
                xlWorkBook.Close(0);
                xlApp.Quit();
            }
            catch(Exception ex)
            {
                throw new Exception("Al Cargar. " + ex.Message);
            }
            releaseObject(xlWorkBook);
            releaseObject(xlApp);
            System.Threading.Thread.CurrentThread.CurrentCulture = oldCI;
        }
        catch(Exception ex)
        {
            throw ex;
        }

    }