public ActionResult FileUpload()
 {
     try
     {
         HttpPostedFileBase file = Request.Files["file"];
         if (file != null)
         {
             string      connectionString = ConfigurationManager.ConnectionStrings["IfoundDbContext"].ConnectionString;
             string      filePath         = Path.Combine(HttpContext.Server.MapPath("../Uploads"), Path.GetFileName(file.FileName));
             DataTable   dt          = _studentService.AddStudentByExcel(filePath, "Sheet1");
             SqlBulkCopy sqlbulkcopy = new SqlBulkCopy(connectionString, SqlBulkCopyOptions.UseInternalTransaction);
             sqlbulkcopy.DestinationTableName = "Students";//数据库中的表名
             sqlbulkcopy.WriteToServer(dt);
             return(RedirectToAction("Index"));
         }
         else
         {
             ViewData["AddExcelError"] = "Add Excel Error";
             return(RedirectToAction("Index"));
         }
     }
     catch
     {
         return(RedirectToAction("Index"));
     }
 }