$("#btnAdd").click(function (e) {
        e.preventDefault();
        //$("#form1").submit();
        var file1;
        if (document.getElementById("exampleInputFile1").files.length > 0)
            file1 = document.getElementById("exampleInputFile1").files[0];

        var file2;
        if (document.getElementById("exampleInputFile2").files.length > 0)
            file2 = document.getElementById("exampleInputFile2").files[0];


        var file3;
        if (document.getElementById("exampleInputFile3").files.length > 0)
            file3 = document.getElementById("exampleInputFile3").files[0];

        var file4;
        if (document.getElementById("exampleInputFile4").files.length > 0)
            file4 = document.getElementById("exampleInputFile4").files[0];

        var file5;
        if (document.getElementById("exampleInputFile5").files.length > 0)
            file5 = document.getElementById("exampleInputFile5").files[0];
      

        var formData = new FormData();
        formData.append("MainGroupId", $("#MainGroup").val());
        formData.append("MainGroupName", $("#MainGroup option:selected").text());

        formData.append("SubGroupId", $("#SubGroup").val());
        formData.append("SubGroupName", $("#SubGroup option:selected").text());

        formData.append("NewBrandId", $("#NewBrandId").val());
        formData.append("NewBrandName", $("#NewBrandId option:selected").text());

        formData.append("NewCategoryId", $("#NewCategoryId").val());
        formData.append("NewCategoryName", $("#NewCategoryId option:selected").text());

        formData.append("NewColorId", $("#NewColorId").val());
        formData.append("NewColorName", $("#NewColorId option:selected").text());

        formData.append("IsActive", $("#IsActive").val());
        formData.append("Description", $("#Description").val());

        formData.append("Image1", file1);
        formData.append("Image2", file2);
        formData.append("Image3", file3);
        formData.append("Image4", file4);
        formData.append("Image5", file5);

        formData.append("OperationType", $("#hdnType").val());

        $.ajax({
            type: "POST",
            url: _urlBase + '/ProductManage/AddTempProduct',
            data: formData,
            dataType: 'json',
            contentType: false,
            processData: false,
            success: function (data) {

                if (data.ResultState == true) {
                    // done
                }
                else if (data.ResultState == false)
                    ShowMessage(data.SqlError);

            },
            error: function (error) {
                alert("errror");
            }
        });

    });

Backend C# code

[HttpPost]
        public JsonResult AddTempProduct()
        {
            Result r = new Result();
            try
            {
                ArticlePOCO article = new ArticlePOCO();


                article.MainGroupId = Request.Form["MainGroupId"];
               

                string OperationType = Request.Form["OperationType"];

                
    if (Request.Files.Count > 0)
                    {
                        if (Request.Files["Image1"] != null)
                        {
                            article.Image1 = Request.Files["Image1"];
                        }
                        if (Request.Files["Image2"] != null)
                        {
                            article.Image2 = Request.Files["Image2"];
                        }
                        if (Request.Files["Image3"] != null)
                        {
                            article.Image3 = Request.Files["Image3"];
                        }
                        if (Request.Files["Image4"] != null)
                        {
                            article.Image4 = Request.Files["Image4"];
                        }
                        if (Request.Files["Image5"] != null)
                        {
                            article.Image5 = Request.Files["Image5"];
                        }
                    }
     
                

                
            }
            catch (Exception ex)
            {
                r.ResultState = false;
                r.SqlError = ex.Message;
            }

            System.Web.Mvc.JsonResult jsonRe = new System.Web.Mvc.JsonResult()
            {
                Data = r,
                JsonRequestBehavior = System.Web.Mvc.JsonRequestBehavior.DenyGet
            };

            return jsonRe;

        }