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

[Rajesh]

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" })

[Christopher Issac Sunder K]

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" /> 

} 

 

 

Controller: 

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; 

        }       

    } 

 

Sample: http://www.syncfusion.com/downloads/support/forum/140938/ze/Validation248902933  

Please let us know if you need any further assistance. 

Thanks,
Christo