Error sending file by AJAX

@model  PCotiza_compras.Models.testsoru

@{
ViewBag.Title = "Kyo_2";
}
<script src='http://code.jquery.com/jquery-latest.min.js' type='text/javascript'></script>

<div class="container">
<div class=row"">
    <div class="col-xs-12">
        <script>
            var f = new Date();
            document.write(f.getDate() + "/" + (f.getMonth() +1) + "/" + f.getFullYear());
        </script>
    </div>
    <div class="col-lg-6">

      @using (Html.BeginForm("KyoTest", "Home", FormMethod.Post, new { enctype = "multipart/form-data" })) { 
            <table class="table table-hover">
                <thead>
                    <tr>
                        <th>Firstname</th>
                        <th>Lastname</th>

                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>Nombre</td>
                        <td>
                            <input type="text" placeholder="NombreDeProyecto" id="name" />
                        </td>

                    </tr>
                    <tr>
                        <td>Formato</td>
                        <td>
                            <label>Formato: </label><input type="file" id="format" name="files[]" multiple />
                            <output id="list"></output>

                            <script>
                                              function handleFileSelect(evt) {
                                                var files = evt.target.files; // FileList object

                                                // files is a FileList of File objects. List some properties.
                                                var output = [];
                                                for (var i = 0, f; f = files[i]; i++) {
                                                    output.push('<h4>Datos de archivo</h4>', '<label>Nombre: </label><li>', escape(f.name),
                                                                '<input class="hidden" type="text" id="fn"  name="name" value="', escape(f.name), '" /></li>',
                                                                '<label>Tipo: </label><li>', f.type || 'n/a',
                                                               '<input class="hidden" type="text"  id="ft"  name="name" value="', f.type, '" /></li>',
                                                               '<label>Bytes: </label><li> ', f.size,
                                                                '<input class="hidden" type="text"  id="fs"  name="name" value="', f.size, '" /></li>',
                                                               ' <label>Modificado: </label><li> ',
                                                              f.lastModifiedDate.toLocaleDateString(), '</li>');
                                                }
                                                document.getElementById('list').innerHTML = '<ul>' + output.join('') + '</ul>';
                                              }

                                              document.getElementById('format').addEventListener('change', handleFileSelect, false);
                            </script>
                        </td>

                    </tr>
                    <tr> 
                        <td>Wiw</td>
                        <td>
                            <p>
                                @Session["Wiw"]
                                <input type="text" class="hidden" id="wiw" value="@Session["WiW"]" />
                            </p>
                        </td>

                    </tr>
                    <tr>
                        <td>
                            <input type="button" onclick="trymeplz()" name="name" value="trymeplz" />
                            <input type="submit" value="Upload Image" />
                        </td>
                    </tr>
                </tbody>
            </table>
      }
</div>
    <div class="col-lg-6">
        <output id="list"></output>
    </div>
</div>
</div>
<script>
  function  trymeplz(){
  var obj = {};

  var dt = new Date();
  obj.namePro = $("[id*=name]").val();
  obj.format = $('#format').prop("files")[0];
  obj.wiw = document.getElementById("wiw").value;
  obj.fname = document.getElementById("fn").value;
  obj.sz = document.getElementById("fs").value;
  obj.ftype = document.getElementById("ft").value;
  obj.dt = dt.getDate() + "/" + (dt.getMonth() + 1) + "/" + dt.getFullYear();

   
  var jsonob = JSON.stringify(obj);
  alert(jsonob);
        $.ajax({
                url: '@Url.Action("KyoTest", "Home")',
                method: "POST",
                dataType: 'json',
                data: jsonob,
                processData: false,
                contentType: 'multipart/form-data',
                success: function (XMLHttpRequest, textStatus, errorThrown) {
                    alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown);
                },
                error: function(er){
                    alert("something got wrong" + er);
                }
        });
  }
</script>

[HttpPost]
public ActionResult KyoTest(testsoru form) {

  string constr = "Data Source=DMX87025;Initial Catalog=DB_PCC;Integrated Security=True";



  using(SqlConnection con = new SqlConnection(constr)) {
    string query = "INSERT INTO Testsoru([Name],[Wiw],[Formato],[Size],[FName],[Type])" +
      " VALUES(@Name,@wiw,@format,@Size,@FName,@Type)";

    using(SqlCommand cmd = new SqlCommand(query)) {
      cmd.Connection = con;
      cmd.Parameters.AddWithValue("@Name", form.name);
      cmd.Parameters.AddWithValue("@wiw", form.wiw);
      cmd.Parameters.AddWithValue("@format", form.formato);
      cmd.Parameters.AddWithValue("@Size", null);
      cmd.Parameters.AddWithValue("@FName", null);
      cmd.Parameters.AddWithValue("@Type", null);
      con.Open();
      cmd.ExecuteNonQuery();
      con.Close();
      con.Close();
    }

  }


  return View(form);
}
//----Modelo de datos

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace PCotiza_compras.Models {
  public class testsoru {

    public int id {
      get;
      set;
    }
    public string name {
      get;
      set;
    }
    public string wiw {
      get;
      set;
    }
    public string size {
      get;
      set;
    }
    public string ftype {
      get;
      set;
    }
    public string fname {
      get;
      set;
    }

    public HttpPostedFileWrapper formato {
      get;
      set;
    }
  }
}