‫نحوه استفاده از ViewModel در ASP.NET MVC

public class ResumeViewModel
    {
        public ResumeViewModel()
        {
            
        }
        public ResumeViewModel(IEnumerable<Resume> resum, IEnumerable<Work_Experience_Job_Seeker> workExperienceJobSeekerOfViewModel, IEnumerable<Job_Expertises> jobExpertisesOfViewModel, IEnumerable<Degrees_Work_Experience_Required> degreesWorkExperienceRequiredOfViewModel, IEnumerable<Specialized_Course> specializedCourseOfViewModel, IEnumerable<Book_Published> bookPublishedOfViewModel, IEnumerable<Basic_Table> basicTable)
        {
            ResumeOfViewModel = resum;
            WorkExperienceJobSeekerOfViewModel = workExperienceJobSeekerOfViewModel;
            JobExpertisesOfViewModel = jobExpertisesOfViewModel;
            DegreesWorkExperienceRequiredOfViewModel = degreesWorkExperienceRequiredOfViewModel;
            SpecializedCourseOfViewModel = specializedCourseOfViewModel;
            BookPublishedOfViewModel = bookPublishedOfViewModel;
            BasicTable = basicTable;
        }
        public IEnumerable<Resume> ResumeOfViewModel { get; set; }
        public IEnumerable<Work_Experience_Job_Seeker> WorkExperienceJobSeekerOfViewModel { get; set; }
        public IEnumerable<Job_Expertises> JobExpertisesOfViewModel { get; set; }
        public IEnumerable<Degrees_Work_Experience_Required> DegreesWorkExperienceRequiredOfViewModel { get; set; }
        public IEnumerable<Specialized_Course> SpecializedCourseOfViewModel { get; set; }
        public IEnumerable<Book_Published> BookPublishedOfViewModel { get; set; }
        public IEnumerable<Basic_Table> BasicTable { get; set; }

        public int NumberForm { get; set; } // EditResumes.chtml & ShowResumes.chtml  ===> baraye select kardan formha :D 

        }

        [HttpGet]
        public ActionResult EditResumes(int id)
        {
            var contex = new Final_My_ProjectEntities2();
            var res1 = contex.Resumes.Where(rec => rec.Resume_ID == id);
            var res2 = contex.Work_Experience_Job_Seeker.Where(rec => rec.Resume_ID == id).ToList();
            var res3 = contex.Job_Expertises.Where(rec => rec.Resume_ID == id).ToList();
            var res4 = contex.Degrees_Work_Experience_Required.Where(rec => rec.Resume_ID == id).ToList();
            var res5 = contex.Specialized_Course.Where(rec => rec.Resume_ID == id).ToList();
            var res6 = contex.Book_Published.Where(rec => rec.Resume_ID == id).ToList();
            var res12 = contex.Basic_Table.ToList();
            var viewModel = new ResumeViewModel(res1, res2, res3, res4, res5, res6,res12);
            var items = new SelectList(
                 new[]
                    {
                        new {Value = "1", Text = "فرم مهارت ها"},
                        new {Value = "2", Text = "فرم کتاب/مقالات منتشر شده"},
                        new {Value = "3", Text = "فرم سابقه کاری"},
                        new {Value = "4", Text = "فرم دوره‌های تخصصی گذرانده"},
                        new {Value = "5", Text = "فرم تخصص‌های شغلی"},
                        new {Value = "6", Text = "فرم مدارک تحصیلی"}
                    },
             "Value", "Text");

            ViewBag.Form = new SelectList(items, "Value", "Text");

            var res7 = contex.Basic_Table.Where(rec => rec.Domain == "MilitaryStatus").ToList();
            ViewBag.MilitaryStatus = new SelectList(res7, "Value", "Meaning",res1);

            var res8 = contex.Basic_Table.Where(rec => rec.Domain == "Sex");
            ViewBag.Sex = new SelectList(res8, "Value", "Meaning", res1);

            var res9 = contex.Basic_Table.Where(rec => rec.Domain == "MartialStatus").ToList();
            ViewBag.MartialStatus = new SelectList(res9, "Value", "Meaning", res1);

            var res10 = contex.Basic_Table.Where(rec => rec.Domain == "Degree").ToList();
            ViewBag.Degree = new SelectList(res10, "Value", "Meaning");

            var res11 = contex.Basic_Table.Where(rec => rec.Domain == "Ability").ToList();
            ViewBag.Ability = new SelectList(res11, "Value", "Meaning");


            return View(viewModel);
        }

@model Final_My_Project.ViewModels.ResumeViewModel

@{
    ViewBag.Title = "ویرایش رزومه";
    ViewBag.PartOne = "فرم مهارت ها";
    ViewBag.PartTwo = "فرم کتاب/مقالات منتشر شده";
    ViewBag.Part3 = "فرم سابقه کاری";
    ViewBag.Part4 = "فرم دوره‌های تخصصی گذرانده";
    ViewBag.Part5 = "فرم تخصص‌های شغلی";
    ViewBag.Part6 = "فرم مدارک تحصیلی";

}
<h2 style="font-family:  Arial;">@ViewBag.Title</h2><br/>
   <script type="text/javascript">
       $(function () {
           $('#Gender').change(function () {
               var selectKind = $(this).find('option:selected').text();
               var divMilitary;
               if (selectKind == "زن") {
                   divMilitary = $('#Military');
                   divMilitary.hide();
                   divMilitary.css('display', 'none');
               }
               else if (selectKind == "مرد") {
                   divMilitary = $('#Military');
                   divMilitary.show();
                   divMilitary.css('display', 'block');

               }
           });
       });
</script>

<script type="text/javascript">
    $(function () {
        $('#SelectForm').change(function () {
            var selectFrom = $(this).find('option:selected').text();

            if (selectFrom == "فرم مهارت ها") {
                $('#PartOne').show();
                $('#PartOne').css('display', 'block');
                $('#PartTwo').hide();
                $('#PartTwo').css('display', 'none');
                $('#Part3').hide();
                $('#Part3').css('display', 'none');
                $('#Part4').hide();
                $('#Part4').css('display', 'none');
                $('#Part5').hide();
                $('#Part5').css('display', 'none');
                $('#Part6').hide();
                $('#Part6').css('display', 'none');


            }
            if (selectFrom == "فرم کتاب/مقالات منتشر شده") {
                $('#PartTwo').show();
                $('#PartTwo').css('display', 'block');
                $('#PartOne').show();
                $('#PartOne').css('display', 'none');
                $('#Part3').hide();
                $('#Part3').css('display', 'none');
                $('#Part4').hide();
                $('#Part4').css('display', 'none');
                $('#Part5').hide();
                $('#Part5').css('display', 'none');
                $('#Part6').hide();
                $('#Part6').css('display', 'none');

            }
            if (selectFrom == "فرم سابقه کاری") {

                $('#Part3').show();
                $('#Part3').css('display', 'block');
                $('#PartTwo').hide();
                $('#PartTwo').css('display', 'none');
                $('#PartOne').show();
                $('#PartOne').css('display', 'none');
                $('#Part4').hide();
                $('#Part4').css('display', 'none');
                $('#Part5').hide();
                $('#Part5').css('display', 'none');
                $('#Part6').hide();
                $('#Part6').css('display', 'none');


            }
            if (selectFrom == "فرم دوره‌های تخصصی گذرانده") {

                $('#Part4').show();
                $('#Part4').css('display', 'block');
                $('#PartTwo').hide();
                $('#PartTwo').css('display', 'none');
                $('#PartOne').show();
                $('#PartOne').css('display', 'none');
                $('#Part3').hide();
                $('#Part3').css('display', 'none');
                $('#Part5').hide();
                $('#Part5').css('display', 'none');
                $('#Part6').hide();
                $('#Part6').css('display', 'none');

            }
            if (selectFrom == "فرم تخصص‌های شغلی") {

                $('#Part5').show();
                $('#Part5').css('display', 'block');
                $('#PartTwo').hide();
                $('#PartTwo').css('display', 'none');
                $('#PartOne').show();
                $('#PartOne').css('display', 'none');
                $('#Part3').hide();
                $('#Part3').css('display', 'none');
                $('#Part4').hide();
                $('#Part4').css('display', 'none');
                $('#Part6').hide();
                $('#Part6').css('display', 'none');

            }

            if (selectFrom == "فرم مدارک تحصیلی") {

                $('#Part6').show();
                $('#Part6').css('display', 'block');
                $('#Part5').show();
                $('#Part5').css('display', 'none');
                $('#PartTwo').hide();
                $('#PartTwo').css('display', 'none');
                $('#PartOne').show();
                $('#PartOne').css('display', 'none');
                $('#Part3').hide();
                $('#Part3').css('display', 'none');
                $('#Part4').hide();
                $('#Part4').css('display', 'none');
            }

        });
    });

</script>

@Html.DropDownListFor(m=>m.NumberForm, (SelectList)ViewBag.Form, new { id = "SelectForm" })


@using (Html.BeginForm())
{
    @Html.ValidationSummary(true)

        <div id="PartOne" >
    <h3 style="font-family: Arial; color: #008080; font-weight: bold; ">@ViewBag.PartOne</h3><br/>
    @foreach (var item in Model.ResumeOfViewModel)
    {
        <table dir="rtl">
            <tr>
                <td>
                    @Html.Label("عنوان رزومه")
                </td>
                <td>
                    @Html.TextBoxFor(model =>item.Title_Of_Resume  , new {@class = "text", style = "width:100 px"})
                    @Html.ValidationMessageFor(model => item.Title_Of_Resume)
                </td>
            </tr>
            <tr>
                <td>
        <div id="Gender" >
        @Html.Label("نوع جنسیت")
         @Html.DropDownList("نوع جنسیت", new SelectList(ViewBag.Sex, 
                       "Value", "Text", item.Sex_ID == 0 ? 0 : item.Sex_ID))
        @Html.ValidationMessageFor(model => item.Sex_ID)
        </div>
    </td>

                <td>
                    <div >
                        @Html.Label("وضعیت تاهل")
         @Html.DropDownList("وضعیت تاهل", new SelectList(ViewBag.MartialStatus, 
                       "Value", "Text", item.Martial_Status_ID == 0 ? 0 : item.Martial_Status_ID))
                        @Html.ValidationMessageFor(model => item.Martial_Status_ID)
                    </div>

                </td>
            </tr>

            <tr id="Military" style="display: none;">
                <td>
                    @Html.Label("وضعیت نظام وظیفه")
                </td>
                <td>
         @Html.DropDownList("وضعیت نظام وظیفه", new SelectList(ViewBag.MilitaryStatus,
                           "Value", "Text", item.Military_Status_ID == 0 ? 0 : item.Military_Status_ID), new { id = "Gender" })
                    @Html.ValidationMessageFor(model => item.Military_Status_ID)
                </td>

            </tr>

            <tr>
                <td>
                    @Html.Label("آشنایی با رایانه")
                </td>
                <td>
                    @Html.DropDownListFor(model => item.Knowledge_Of_Computers_ID, (SelectList)ViewBag.Ability)
                    @Html.ValidationMessageFor(model => item.Knowledge_Of_Computers_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("آشنایی با امور اداری و دفتری")
                </td>
                <td>
                    @Html.DropDownListFor(model => item.Knowledge_Administrative_and_Clerical_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model => item.Knowledge_Administrative_and_Clerical_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("آشنایی با زبان انگلیسی")
                </td>
                <td>
                    @Html.DropDownListFor(model => item.Knowledge_Of_English_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model => item.Knowledge_Of_English_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("آشنایی با زبان عربی")
                </td>
                <td>
                    @Html.DropDownListFor(model => item.Knowledge_Of_Arabic_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model => item.Knowledge_Of_Arabic_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("آشنایی با ماکروسافت آفیس")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Knowledge_Of_Office_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model => item.Knowledge_Of_Office_ID)
                </td>
            </tr>

            <tr>
                <td>  
                    @Html.Label("آشنایی با امور مالی و حسابداری")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Knowledge_Of_Finance_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model => item.Knowledge_Of_Finance_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("آشنایی با مدیریت")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Knowledge_Of_Manage_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model =>item.Knowledge_Of_Manage_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("گواهینامه رانندگی پایه یک")

                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Driving_license_One_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model =>item.Driving_license_One_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("گواهینامه رانندگی پایه دو")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Driving_license_Two_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model =>item.Driving_license_Two_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("گواهینامه رانندگی پایه موتورسیکلت")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Certificate_Motor_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model =>item.Certificate_Motor_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("ماشین شخصی")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Personal_Vehicle_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model =>item.Personal_Vehicle_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("روابط عمومی")
                </td>
                <td>
                    @Html.DropDownListFor(model =>item.Public_Relationship_ID, (SelectList) ViewBag.Ability)
                    @Html.ValidationMessageFor(model =>item.Public_Relationship_ID)
                </td>
            </tr>

            <tr>
                <td>
                    @Html.Label("دیگر توانایی ها")

                </td>
                <td>
                    @Html.EditorFor(model =>item.Etc_Ability)
                    @Html.ValidationMessageFor(model =>item.Etc_Ability)
                </td>
            </tr>

        </table>
    }
        </div>

    
        <p>
            <input type="submit" value="Save" onclick="return confirm('از ثبت اطلاعات مطمئن هستید؟')" />
        </p>
}

<div>
    @Html.ActionLink("بازگشت به مدیریت رزومه ها", "ManageOfResumes")
</div>

@section scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

        [HttpPost]
        public ActionResult EditResumes(ResumeViewModel model) // model null mishe ! CHERAA??!
        {
            var contex = new Final_My_ProjectEntities2();
            try
            {
                if (ModelState.IsValid)
                {

                    // Code... che cody?
                    contex.SaveChanges();
                }

            }
            catch (Exception)
            {

                ViewBag.wrong = "لطفا داده‌های ورودی را بررسی نمایید";
            }
            return View(model);

        }

 public class ProjectViewModel{
        public ProjectDto Project{ get; set; }
        public ProjectProgramDto ProjectProgram { get; set}
        public IEnumerable<SelectListItem> PriorityListItems { get; set; }
     }

Either ErrorMessageString or ErrorMessageResourceName must be set, but not both.