How to make MVC5 dropdownlist validationAsk Questions

 Posted on 08/16/2018

I'm trying to make a validation for my dropdownlist in MVC5 that user must select an item but I'm not sure how to do it. I've created my list inside the Model class for some reason and now I don't know how to apply [Require(ErrorMessage)] to this program



<label>Project Type:</label>
     @Html.DropDownListFor(m => m.Project_Type, Project1.Models.Dropdowns.GetProjectType(),"--Project Type--",

 new { @class = "form-control" })

<h6 style="text-emphasis-color:red;text-decoration-color:red" class="error">

 @Html.ValidationMessageFor(model => model.Project_Type)</h6>


 public static IEnumerable<SelectListItem> GetProjectType()

    List<SelectListItem> Project_Type = new List<SelectListItem>();

    Project_Type.Add(new SelectListItem() { Text = "type1" });
    Project_Type.Add(new SelectListItem() { Text = "type2" });
    Project_Type.Add(new SelectListItem() { Text = "type3" });
    Project_Type.Add(new SelectListItem() { Text = "type4" });

    return Project_Type;

it has an error when I apply [Require()] [error]image

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Asked by hardik chaudhary on 08/16/2018 Score: 454 points
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1 Answers

1 Corrected Answers
Aproved Answers
Answered by Shailesh Chaudhary on 9/6/2018 7:43:12 AM Score: 802 points

There are few ways to work with DropDownList. I personally like to use Strongly-Type ViewModelinstead of ViewBag.

Screen Shot

Validation message displays when submit button is clicked without selecting Country.

enter image description here


public class Country
    public int Country_id { get; set; }
    public string Description { get; set; }


public class CountryViewModel
    [Display(Name = "Country")]
    [Required(ErrorMessage = "{0} is required.")]
    public int SelectedCountryId { get; set; }

    public IList<SelectListItem> AvailableCountries { get; set; }

    public CountryViewModel()
        AvailableCountries = new List<SelectListItem>();


public class HomeController : Controller
    public ActionResult Create()
        var countries = GetCountries();
        var model = new CountryViewModel {AvailableCountries = countries};
        return View(model);

    public async Task<ActionResult> Create(CountryViewModel countryViewModel)
        if (ModelState.IsValid)
            int countryId = countryViewModel.SelectedCountryId;
            // Do something
        // If we got this far, something failed. So, redisplay form
        countryViewModel.AvailableCountries = GetCountries();
        return View(countryViewModel);

    public IList<SelectListItem> GetCountries()
        // This comes from database.
        var _dbCountries = new List<Country>
            new Country {Country_id = 1, Description = "USA"},
            new Country {Country_id = 2, Description = "UK"},
            new Country {Country_id = 3, Description = "Canada"},
        var countries = _dbCountries
            .Select(x => new SelectListItem {Text = x.Description, Value = x.Country_id.ToString()})
        countries.Insert(0, new SelectListItem {Text = "Choose a Country", Value = ""});
        return countries;


@model DemoMvc.Models.CountryViewModel
    Layout = null;

<!DOCTYPE html>

    <meta name="viewport" content="width=device-width" />


    @using (Html.BeginForm())
        <div class="form-group">
            @Html.LabelFor(model => model.SelectedCountryId, 
               new {@class = "control-label col-md-2"})
            <div class="col-md-10">
                @Html.DropDownListFor(model => model.SelectedCountryId, 
                    Model.AvailableCountries, new {@class = "form-control"})
                @Html.ValidationMessageFor(model => model.SelectedCountryId, 
                     "", new {@class = "text-danger"})

        <input type="submit" value="Submit"/>



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