[Débutant] envoyer mail avec piece jointre

Bonjour, s'il vous plait j'ai un problème au niveau d'uplade une fichier, l'email envoyer mais le fichier non :(

Code:

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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
 
namespace ApplicationMail.Models{
    public class Mail{
        public string From { get; set; }
        [Required(ErrorMessage = "Please provide password", AllowEmptyStrings = false)]
        [DataType(System.ComponentModel.DataAnnotations.DataType.Password)]
        public string Password { get; set; }
        public string To { get; set; }
        public string Subject { get; set; }
        public string Body { get; set; }
    }
}

Code:

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ApplicationMail.Models;
using System.IO;
using System.Net.Mail;
using System.Net; 
namespace ApplicationMail.Controllers{
    public class MailController : Controller{
 
        public ActionResult Index(){
            return View();
        }
 
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult SubmitCV(HttpPostedFileBase file){
            if (file == null){
                ModelState.AddModelError("CustomError", "Please select your file");
                return View();
            }
            if (!(file.ContentType == "application/vnd.openxmlformats-officedocument.wordprocessingml.document" ||
                file.ContentType == "application/pdf")){
                ModelState.AddModelError("CustomError", "Only .docx and .pdf file allowed");
                return View();
            }
            if (ModelState.IsValid){
                try{
                    string fileName = Guid.NewGuid() + Path.GetExtension(file.FileName);
                    file.SaveAs(Path.Combine(Server.MapPath("~/UploadedCV"), fileName));
                    ViewBag.Message = "Successfully Done";
                }
                catch (Exception ex){
                    ViewBag.Message = "Error! Please try again";
                    return View();
                }
            }
            return View();
        }
 [HttpPost]
        public ActionResult Index(ApplicationMail.Models.Mail objModelMail, String From, String password, HttpPostedFileBase file){
            if (ModelState.IsValid){
                using (MailMessage mail = new MailMessage(From, objModelMail.To)){
                    mail.Subject = objModelMail.Subject;
                    mail.Body = objModelMail.Body;
                    if (file != null){
                        string fileName = Path.GetFileName(file.FileName);
                        mail.Attachments.Add(new Attachment(file.InputStream, fileName));
                    }
                    mail.IsBodyHtml = false;
                    SmtpClient smtp = new SmtpClient();
                    smtp.Host = "smtp.gmail.com";
                    smtp.EnableSsl = true;
                    NetworkCredential networkCredential = new NetworkCredential(From, password);
                    smtp.UseDefaultCredentials = true;
                    smtp.Credentials = networkCredential;
                    smtp.Port = 587;
                    smtp.Send(mail);
                    ViewBag.Message = "Sent";
                    return View("Index", objModelMail);
                }
            }
            else{
                return View();
            }
        }
    }
    }

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@model ApplicationMail.Models.Mail
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
<fieldset>
    <legend>
        Send Email
    </legend>
    @using (Html.BeginForm()){
        @Html.ValidationSummary()
        <p>From: </p>
        <p>@Html.TextBoxFor(m => m.From)</p>
        <p>Password: </p>
        <p>@Html.PasswordFor(m => m.Password)</p>
 
        <p>To: </p>
        <p>@Html.TextBoxFor(m => m.To)</p>
        <p>Subject: </p>
        <p>@Html.TextBoxFor(m => m.Subject)</p>
        <p>Body: </p>
        <p>@Html.TextAreaFor(m => m.Body)</p>
        <div class="editor-field">
        <input type="file" name="file" />
         @Html.ValidationMessage("CustomError")
         </div>
        <div><input type="text" name="message"/></div>
        <input type="submit" value="Upload file" onclick="ajouter()" />
        <input type="submit" value="Send" />
    }
</fieldset>
<script type="text/javascript">
 function ajouter() {
             $.ajax({
 
                 url: '@Url.Action("SubmitCV", "Mail")',
                type: 'POST',
                //data: { file: $("#Code_cl").val() },
                });
 
 }
    </script>