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How to show selected value in DropdownList through Viewbag and how to validate it

Here is my code of View : 

@Html.LabelFor(model => model.OperationId, "Operation Name ", new { @class = "control-label" })<b class="mandatory"> * </b><b>:</b>
@Html.EJS().DropDownList("OperationId").Placeholder("Select a Operation").FilterBarPlaceholder("Search Operation").AllowFiltering(true).DataSource((List<OperationModel>)ViewBag.OperationId).Filtering("onfiltering").Fields(new DropDownListFieldSettings { Text = "OperationName", Value = "OperationId" }).Render()        
@Html.ValidationMessageFor(model => model.OperationId, "", new { @class = "text-danger" })

1 Reply

CI Christopher Issac Sunder K Syncfusion Team November 15, 2018 10:13 AM UTC

Hi Rajesh, 
Thank you for contacting Syncfusion Support. 
We have prepared a sample similar to your requirement by passing pre-selected value from ViewBag and added validation for DropDownList control.  
@model Uploader.Controllers.OperationModel 
@using (Html.BeginForm("Register", "Home", FormMethod.Post, null)) 
    @Html.LabelFor(model => model.OperationId, "Operation Name ", new { @class = "control-label" })<b class="mandatory"> * </b><b>:</b> 
    @Html.EJS().DropDownList("OperationId").Width("300").ShowClearButton(true).Placeholder("Select a Operation").FilterBarPlaceholder("Search Operation").AllowFiltering(true).DataSource((List<OperationModel>)ViewBag.OperationId).Fields(new DropDownListFieldSettings { Text = "OperationName", Value = "OperationId" }).Value(ViewBag.Value).Render() 
    @Html.ValidationMessageFor(model => model.OperationId, "", new { @class = "text-danger" }) 
    <br /> 
    <input type="submit" value="Save" class="btn btn-default" /> 
public class HomeController : Controller 
        OperationModel model = new OperationModel(); 
        public ActionResult Index() 
            ViewBag.OperationId= OperationModel.GetAllRecords(); 
            ViewBag.Value = "1006"; 
            return View(); 
        public ActionResult Register(OperationModel model) 
            ViewBag.OperationId = OperationModel.GetAllRecords(); 
            if (ModelState.IsValid) 
               //perform required action after validation. 
            return View("Index"); 
    public class OperationModel 
        [Required(ErrorMessage ="Please Select an Item")] 
        public string OperationId { get; set; } 
        public string OperationName { get; set; } 
        public OperationModel() 
        public OperationModel(string OperationId, string OperationName) 
            this.OperationId = OperationId; 
            this.OperationName = OperationName; 
        public static List<OperationModel> GetAllRecords() 
            List<OperationModel> order = new List<OperationModel>(); 
                order.Add(new OperationModel("1001", "ALFKI")); 
                order.Add(new OperationModel("1002", "ANATR")); 
                order.Add(new OperationModel("1003", "ANTON")); 
                order.Add(new OperationModel("1004", "BLONP")); 
                order.Add(new OperationModel("1005", "BOLID")); 
                order.Add(new OperationModel("1006", "MARTIN")); 
                order.Add(new OperationModel("1007", "CACTU")); 
                order.Add(new OperationModel("1008", "VINCET")); 
                order.Add(new OperationModel("1009", "JOHN")); 
                order.Add(new OperationModel("1010", "MATHEW")); 
            return order; 

Please let us know if you need any further assistance. 


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