why is the dropdown value always null in database mvc razor

Question

I am creating a registration form, there is a field called gender in drop down list. when I select Male or Female from the gender drop down list the value will always be null and return a validation message "Male or Female is not valid for the field"

controller

 [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> Create([Bind(Include = "ID, FirstName,DOB,Gender")] AgentMaster agentMaster)
    {
        if (string.IsNullOrEmpty(Convert.ToString(agentMaster.Gender)))
        {
            ModelState.AddModelError("Gender", "Gender is required");
        }


        if (ModelState.IsValid)
        {
            db.AgentMasters.Add(agentMaster);
            await db.SaveChangesAsync();
            return RedirectToAction("Index");
        }

        return View(agentMaster);
    }

view

@model A.Models.AgentMaster

 <div class="form-group">
        @Html.LabelFor(model => model.Gender, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">

            @Html.DropDownListFor(model => model.Gender, new SelectList(new[] { "Male", "Female" }),"--select--")
            @Html.ValidationMessageFor(model => model.Gender, "", new { @class = "text-danger" })
        </div>
    </div>

in model gender is given as

public Nullable<short> Gender { get; set; }

when I debug the code using break points the vale for gender in [httppost] is null, but by giving 1 or 0 it works. so I use validation in controller to convert to string, but it is not working. Iam not getting where I need to change. can anyone please help to find solution ??

user3559349 · Accepted Answer · 2017-03-24 04:59:57Z

0

Your generating a <select> which posts back a string (either "Male" or "Female" which cannot be bound to a short.

Change the property to string, or if you do want short then you need to generate an IEnumerable<SelectListItem> that has the corresponding Value, for example

new List<SelectListItem>()
{
    new SelectListItem() { Value = "0", Text = "Male" },
    new SelectListItem() { Value = "1", Text = "Female" }
};

however, storing a Gender as a numeric value makes no sense, and the property should be a string or an enum.

answered Mar 24, 2017 at 4:59

user3559349

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8 Comments

user256 Over a year ago

I have got this as correct but the value is not showing in the details , delete and index page ??

user3559349 Over a year ago

I have no idea what your code in those methods are (and I don't even know which of the above options you chose) I assume you chose the correct one which is a string so not sure what your problem is.

user256 Over a year ago

I have written by using text and value, the value 0 or 1 is entering to the database but is showing in the index page (index action method)

user3559349 Over a year ago

Showing what in the index page? - if you really have kept it as 0 and 1, then of course it will shown in the Index page a 0 and 1! What are you expecting?

user256 Over a year ago

gender value is blank in the index page but it is showing in the database. the data is not retrieving from table

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