@using Trirand.Web.Mvc

<!DOCTYPE html>
<html lang="en-us">
    <meta charset="utf-8">
    <title>jqComboBox for ASP.NET MVC - Filter</title>
    <!-- jQuery runtime minified -->
    <script src="~/Scripts/jquery-3.2.1.min.js" type="text/javascript"></script>
    <!-- The jqTreeView client-side javascript -->
    <script src="~/Scripts/trirand/jquery.jqComboBox.min.js" type="text/javascript"></script>
    <!-- The jQuery UI theme that will be used by the grid. -->
    <link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.12.1/themes/redmond/jquery-ui.css" />
    <!-- The jQuery UI theme extension jqTreeView needs -->
    <link rel="stylesheet" type="text/css" href="~/Content/themes/ui.jqComboBox.css" />   

                    new JQComboBox
                        Height = 150,
                        Width = 150,
                        Filter = Trirand.Web.Mvc.Filter.Contains,
                        Items = ViewData["items"] as List<JQListItem>
                    }, "combobox"))

    <br /><br /><br />
    <br /><br /><br />        
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Trirand.Web.Mvc;
using MVCDemo.Models;

namespace MVCDemo.Controllers.ComboBox
    public partial class ComboBoxController : Controller    
        // the parameter that holds the selected value is equal to the ID of the 
        // ComboBox control plus "_selectedValue"
        // e.g. if the ID="combobox", then the value is passed in "combobox_selectedValue"
        // note that the ID is case-sensitive
        public ActionResult Filter()
            var northWindModel = new NorthwindDataContext();

            List<Order> orders = northWindModel.Orders.ToList<Order>();
            List<JQListItem> items = new List<JQListItem>();

            foreach (Order order in orders)             
                JQListItem item = items.Find(i => i.Text == order.ShipName);
                if (item == null)
                    items.Add(new JQListItem { Text = order.ShipName, Value = order.CustomerID });
            // ViewData["items"] will be used in the View to populate the dropdown
            ViewData["items"] = items;
            return View();

Switch theme:

Theming is based on the very popular jQuery ThemeRoller standard. This is the same theming mechanism used by jQuery UI and is now a de-facto standard for jQuery based components. The benefits of using ThemeRoller are huge. We can offer a big set of ready to use themes created by professional designers, including Windows-like themes (Redmond), Apple-like theme (Cupertino), etc. In addition to that any jQuery UI controls on the same page will pick the same theme.

Last, but not least, you can always roll your own ThemeRoller theme, using the superb Theme Editor

To use a theme, simply reference 2 Css files in your Html <head> section - the ThemeRoller theme you wish to use, and the jqGrid own ThemeRoller Css file. For example (Redmond theme):

<link rel="stylesheet" type="text/css" media="screen" href="/themes/redmond/jquery-ui-1.8.2.custom.css" />
<link rel="stylesheet" type="text/css" media="screen" href="/themes/ui.jqgrid.css" />