Selecting the Key value of the selected item in AutoComplete Text box.

Hi Gopi,

Try following:

Index.cshtml

@model WebApplication2.Controllers.City
@{
    Layout = null;
}




@using (Html.BeginForm())
{
    @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
}

HomeController.cs

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

namespace WebApplication2.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }

        [HttpPost]
        public JsonResult Index(string Prefix)
        {
            //Note : you can bind same list from database  
            List ObjList = new List()
            {

                new City {Id=1,Name="Latur" },
                new City {Id=2,Name="Mumbai" },
                new City {Id=3,Name="Pune" },
                new City {Id=4,Name="Delhi" },
                new City {Id=5,Name="Dehradun" },
                new City {Id=6,Name="Noida" },
                new City {Id=7,Name="New Delhi" }

            };
            //Searching records from list using LINQ query  
            var Name = (from N in ObjList
                        where N.Name.StartsWith(Prefix)
                        select new { N.Name, N.Id });
            return Json(Name, JsonRequestBehavior.AllowGet);
        }
    }
    public class City
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

For more details:

Autocomplete
- https://jqueryui.com/autocomplete/#remote-jsonp
How to Map data in jquery-ui autocomplete is not working
- https://stackoverflow.com/questions/13063527/how-to-map-data-in-jquery-ui-autocomplete-is-not-working
AutoComplete Textbox in MVC Using jQuery and WebAPI
- https://www.c-sharpcorner.com/UploadFile/raj1979/autocomplete-textbox-in-mvc-using-jquery-and-webapi/

Hope this will help you!