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Wednesday, 25 November 2015

DropdownList AutoPostback Functionality In MVC Using C#.Net

11/25/2015 - By Pranav Singh 0

This article will show you how you can make dropdownlist autopostback functionality in asp.net mvc using c#.net.  This article you can use MVC3/MVC4/MVC5/MVC6.


So for this article first we will create a new asp.net mvc application and add a model class file and add the below code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Models
{
    public class StateModel
    {
        public int StateId { get; set; }
        public SelectList StateList { get; set; }
        public List<City> CityList { get; set; }
    }
    public class City
    {
        public int CityId { get; set; }
        public int StateId { get; set; }
        public string CityName { get; set; }
    }
}

Now add controller class and the below code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication1.Models;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            StateModel objStateModel = new StateModel();
            objStateModel.StateList = State();
            List<City> objcity = new List<City>();
            objcity = GetCityList(0);
            objStateModel.CityList = objcity;
            return View(objStateModel);
        }
        [HttpPost]
        public ActionResult Index(int StateId)
        {
            StateModel objStateModel = new StateModel();
            objStateModel.StateList = State();
            List<City> objcity = new List<City>();
            objcity = GetCityList(StateId);
            objStateModel.CityList = objcity;
            return View(objStateModel);
        }
        public SelectList State()
        {
            List<SelectListItem> items = new List<SelectListItem>();
            items.Add(new SelectListItem() { Text = "State 1", Value = "1", Selected = true });
            items.Add(new SelectListItem() { Text = "State 2", Value = "2", Selected = false });

            SelectList objstatelist = new SelectList(items, "Value", "Text", 0);
            return objstatelist;
        }
        public List<City> GetCityList(int stateID)
        {
            List<City> objCity = new List<City>();
            objCity.Add(new City { CityId = 1, StateId = 1, CityName = "City 1" });
            objCity.Add(new City { CityId = 2, StateId = 2, CityName = "City 2" });
            objCity.Add(new City { CityId = 3, StateId = 1, CityName = "City 3" });
            return objCity.Where(m => m.StateId == stateID).ToList();
        }
    }
}

Now create view and add the below code into view page.

@model MvcApplication1.Models.StateModel
@{
    ViewBag.Title = "DropdownList AutoPostback Functionality In MVC Using C#.Net";
}
@using (Html.BeginForm("Index", "Home"))
{
    @Html.DropDownListFor(model => model.StateId, new SelectList(Model.StateList, "Value", "Text"), new { @onchange = "this.form.submit();" })
    <br />
    <br />
    <div>
      <b>  CITY AS PER STATE</b></div>
    foreach (var item in Model.CityList)
    {
    <div>
        <b>City Name :</b>@item.CityName</div>
    }
}

Now run the page to check the output.


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