Html.Dropdownlist selected value is not posted back to the Controller from view

Question

I am trying to have a dropdownlist on Create.chtml where a user can select a 'NAME' from the dropdownlist and the corresponding value (ID) should be sent back to controller to add it to the database table.

What is working: I can see the dropdownlist with NAMES on the Create.chtml view page

What is NOT working: when a NAME is selected from the dropdownlist in the view, its value (ID) is not passed to Controller

Please see the code below to identify where I might be doing it wrong.

Controller:

//
        // GET: /OrganizationCodes/Create

        public ActionResult Create()
        {

            var orgzList = (from x in db.TABLE_ORGANIZATIONS
                                                   select new TABLE_ORGANIZATIONSDTO
                                                   {
                                                       ID = x.ID,
                                                       NAME = x.NAME
                                                   }).OrderBy(w => w.NAME).ToList();

            ViewBag.orgz = new SelectList(orgzList, "ID", "NAME");

            return View();
        }

        public class TABLE_ORGANIZATIONSDTO
        {
            public string NAME { get; set; }
            public int ID { get; set; }
        }

        //
        // POST: /OrganizationCodes/Create

        [HttpPost]
        public ActionResult Create(TABLE_CODES dp)
        {
            try
            {
                using (var db = new IngestEntities())
                {


                    TABLE_CODES codes_temp = new TABLE_CODES();
                    ViewBag.orgz = codes_temp;

                    db.AddToTABLE_CODES(dp);
                    db.SaveChanges();
                }

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

===================================================================================
View: 'Create.chtml'

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

    <fieldset>

         <div class="editor-field">
            @Html.DropDownList("orgz", (SelectList)ViewBag.orgz)
        </div>      

        <p>
            <input type="submit" value="Create" />
        </p>

   </fieldset>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

Edit 1:

Edit 2:

I am trying to have a view with a dropdownlist of NAMES with value as ID from table 'TABLE_ORGANIZATIONS' which should be added to table 'TABLE_CODES' -> 'MANAGER' column as a number

Answer 1

On your action Create, [HttpPost] version, in which variable are you expecting to see the value of your selected name?

You've named your <select> element with id = "orgz", but you don't have a parameter to your action method named "orgz".

Edit:

When you do:

@Html.DropDownList("orgz", (SelectList)ViewBag.orgz)

You're going to end up with HTML like this:

<select id="orgz" name="orgz">...</select>

When the form is posted back to the controller action, it will try to find a variable called "orgz" that it will put the selected item from your <select> element into. You are missing this.

Try changing your [HttpPost] version of Create to include an "orgz" variable:

public ActionResult Create(TABLE_CODES dp, int orgz)
{
  // orgz will contain the ID of the selected item
}

Then your variable "orgz" will contain the ID of the selected item from your drop down list.