There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'designid'.

Question

When i am passing data from view to controller then below error is coming

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'designid'.

                                <div class="form-group">
                                    @Html.LabelFor(model => model.Design_ID, "Select Designation Level", htmlAttributes: new { @class = "control-label col-md-6" })
                                    <div class="col-md-10">
                                        @Html.DropDownList("designid", null, "Select Designation", htmlAttributes: new { @class = "form-control", @id = "select2-1" })
                                        @Html.ValidationMessageFor(model => model.Design_ID, "", new { @class = "text-danger" })
                                    </div>
                                </div>

  public ActionResult NewCompany()
        {
            var model = new CompanyMV();

            var deptid = 0;
            ViewBag.Dept_ID = new SelectList(DB.tbl_department.Where(bt => bt.Dept_ID > deptid ), "Dept_ID", "Dept_Name", "0");

            var designid = 0;
 
      

            ViewBag.designid = new SelectList(DB.tbl_Designation.Where(bt => bt.Design_ID > designid), "Design_ID", "Design_Name", "0");



            return View(model);
        }

Answer 1

i did not understand ,what you want to make me understand was working fine,can you create example for me plz.or where i am making mistake

namespace MvcBasic.Controllers
{
    public class tbl_Designation
    {
        public int Design_ID { get; set; }
        public string Design_Name { get; set; }
    }
    public class BasicFormsController : Controller
    {
        private List<tbl_Designation> tbl_Designations;
        public BasicFormsController()
        {
            tbl_Designations = new List<tbl_Designation>()
            {
                new tbl_Designation()
                {
                    Design_ID = 1,
                    Design_Name = "Hello"
                },
                new tbl_Designation()
                {
                    Design_ID = 2,
                    Design_Name = "World"
                },
                new tbl_Designation()
                {
                    Design_ID = 3,
                    Design_Name = "Foo"
                },
                new tbl_Designation()
                {
                    Design_ID = 4,
                    Design_Name = "Bar"
                },
            };
        }
        // GET: BasicForms
        [HttpGet]
        public ActionResult Index()
        {
            ViewBag.Design_ID = new SelectList(tbl_Designations.AsEnumerable(), "Design_ID", "Design_Name");
            return View();
        }

        [HttpPost]
        public ActionResult Index(tbl_Designation model)
        {
            ViewBag.Design_ID = new SelectList(tbl_Designations.AsEnumerable(), "Design_ID", "Design_Name");
            return View(model);
        }

    }
}

@model MvcBasic.Controllers.tbl_Designation

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()
    
    <div class="form-horizontal">
        <h4>ViewModel</h4>
        <hr />
        <div class="form-group">
            <div class="col-md-10">
                <div class="checkbox">
                    @Html.DropDownList("Design_ID", null, "Select Designation", htmlAttributes: new { @class = "form-control", @id = "select2-1" })
                </div>
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Submit" class="btn btn-default" />
            </div>
        </div>
    </div>
}

Answer 2

There is a misunderstanding of how the DropDownList overload works. The DropDownList is named "designid". Therefore, DropDownList HTML helper is looking for a key in the ViewBag that matches the DropDownList named "designid" which does not exist.

@Html.DropDownList("designid", null, "Select Designation", htmlAttributes: new { @class = "form-control", @id = "select2-1" })

Below is the ViewBag.designid assignment which does not have a value option named designid. The option value is named Design_ID.

ViewBag.designid = new SelectList(DB.tbl_Designation.Where(bt => bt.Design_ID > designid), "Design_ID", "Design_Name", "0");

On a side note, unless you have records in the tbl_Designation table Design_ID equal to or less than zero there is no need for the Where.

Reference documentation

DropDownList Class

Most beginning level tutorials cover this concept.

Using the DropDownList Helper with ASP.NET MVC

Answer 3

The error message suggests that the key "designid" is not found in the ViewData dictionary that is passed from the controller to the view.

One possible solution is to ensure that the name of the DropDownList matches the key in the ViewData dictionary. In this case, you should change the DropDownList code to:
@Html.DropDownList("Design_ID", null, "Select Designation", htmlAttributes: new { @class = "form-control", @id = "select2-1" })

Answer 4

Hi @akhter hussain

@Html.DropDownList("designid", null, "Select Designation", htmlAttributes: new { @class = "form-control", @id = "select2-1" })

The "designid" in this stands for List<SelectListItem> datalist. "Select Designation" It represents the initial value of the dropdownlist.

I can give an example.

code:

public ActionResult Index()
        {
            
            ViewData["designid"] = GetList();
            return View();
        }
        private List<SelectListItem> GetList()
        {
            List<SelectListItem> datalist = new List<SelectListItem>();
            for (int i = 0; i < 24; i++)
            {
                if (i < 10)
                {
                    datalist.Add(new SelectListItem
                    {
                        Text = "0" + i.ToString(),
                        Value = "0" + i.ToString()
                    });
                }
                else
                {
                    datalist.Add(new SelectListItem { Text = i.ToString(), Value = i.ToString() });
                }
            }
            return datalist;
        }

@Html.DropDownList("designid", null, "Select Designation", htmlAttributes: new { @class = "form-control", @id = "select2-1" })

output:

Best regards,
Qi You

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