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The ASP.NET Core ComboBox component is a drop-down list with editable textbox that also allows users to choose an option from a predefined pop-up list. It can be used as an alternative to the HTML select tag and has several out-of-the-box features such as data binding, filtering, grouping, cascading, templates, UI customization, pop-up list customization, and more.

ASP.NET Core ComboBox data binding from different data sources

Data binding

Bind data from different data sources in an array or list of primitive data, JSON data collections, or remote data sources using adapters such as OData, OData V4, URL, JSON, and Web API.

The control uses the Essential JS 2 data manager to manage data, and also has customization options for data requests and processing.

Custom value

The editable combo box allows the entry of a custom value when the option the user searched for is not available in the pop-up list. Also, you can set a value for the combo box or get the selected value from the combo box at any time through the interactive APIs.

ASP.NET Core ComboBox that allows custom values in the pop-up list


The combo box provides a built-in filtering support with a rich set of filtering configurations to meet all the application needs.

ASP.NET Core ComboBox filtering search based on custom algorithm

Custom filtering

Filter queries are customizable, and users can use their own filter libraries to filter data.

ASP.NET Core ComboBox filtering with diacritic symbol sensitivity

Diacritic sensitivity

The ASP.NET Core ComboBox control supports diacritic-sensitive search. This behavior can be turned on and off.

ASP.NET Core ComboBox filtering with case sensitivity and minimum search characters

Filter settings

The filter search can be customized to be case sensitive, and can be performed with the minimum query string characters.

ASP.NET Core ComboBox Grouping of pop-up list items based on category

Grouping with category

Group the pop-up list items with a corresponding category that makes it easy for users to pick an item quickly from the drop-down, and also improves the visual experience for users.


The autofill option allows users to easily search through the options in the combo box. When a user types a query string to search, the available matching options will be filled automatically.

ASP.NET Core ComboBox autofill option while typing

Cascading combo boxes

The ASP.NET Core ComboBox control provides an option to create multiple cascading combo boxes. Users can populate the data source of the second ComboBox based on the value selected from the first ComboBox.

Another important combo box feature is templates, which allow you to make custom changes to the header, footer, and list items in the pop-up list to make them look unique.

Styling ASP.NET Core ComboBox pop-up list with a header template

Header template

Design your own header for the pop-up list using a header template.

Styling ASP.NET Core ComboBox pop-up list with item template

Item template

Define the appearance of each item in the pop-up list with item templates.

Styling ASP.NET Core ComboBox pop-up list with footer template

Design your own custom and static footers for the pop-up list using footer templates.

Customizing the UI

Users can customize each part of the combo box based on their application requirements.

ASP.NET Core ComboBox pop-up list with icons

Icons in list items

Each list item can be configured to display a custom icon to improve the component’s readability and appearance.

ASP.NET Core ComboBox pop-up list custom appearance when no records are found

Empty record

Configure a custom look for the pop-up list when there are no items to display.

ASP.NET Core ComboBox the pop-up list dimensions customization

Customize dimensions

The dimensions of the pop-up list can be customized to fit the application.

ASP.NET Core ComboBox with form validation

Forms support

Since the combo box is a form component, it supports HTML forms, template-driven forms (Angular), and reactive forms.

Mobile responsive UI

The ASP.NET Core ComboBox control supports a responsive mode that provides an adaptive, redesigned UI appearance for mobile devices and touch actions.

Web accessibility

  • Fully supports WAI-ARIA accessibility guidelines to work with screen readers and assistive devices.

  • Follows WAI-ARIA best practices for implementing keyboard interaction.

  • Designs the UI element visuals such as foreground color, background color, line spacing, text, and images based on WCAG 2.0 standard.

  • Supports right-to-left (RTL) direction for users working with RTL languages like Hebrew, Arabic, or Persian.

Developer friendly APIs

Developers can customize all UI elements and control their behaviors according to the end user’s requirements using its rich set of client-side APIs.

Other supported frameworks

ComboBox is also available in Blazor, Angular, React, Vue, and JavaScript frameworks. Check out the different ComboBox platforms from the links below,

ASP.NET Core ComboBox Code Example

Easily get started with the ASP.NET Core ComboBox using a few simple lines of HTML and TS code example as demonstrated below. Also explore our ASP.NET Core ComboBox Example that shows you how to render and configure a ComboBox in ASP.NET Core.

    <div id='container' style="margin:0 auto; width:300px;">
        <!--element which is going to render the ComboBox-->
        <input type="text" tabindex="1" id='comboelement' />
import { ComboBox } from '@syncfusion/ej2-dropdowns';

// initialize ComboBox component
let comboBoxObject: ComboBox = new ComboBox();

// render initialized ComboBox


Frequently Asked Questions

  • A great alternative to the HTML select tag, with a modern look and feel.
  • Editable combo box with advanced features, including auto suggestion, grouping, sorting, and more.
  • Support for complete customization of the UI and pop-up list through different template options.
  • One of the best ASP.NET Core ComboBox in the market that offers feature-rich UI to interact with the software.
  • Simple configuration and API.
  • Supports all modern browsers.
  • Mobile-touch friendly and responsive.
  • Extensive demos and documentation to learn quickly and get started with ComboBox ASP.NET Core.

You can find our ASP.NET Core ComboBox demo here.

No, this is a commercial product and requires a paid license. However, a free community license is also available for companies and individuals whose organizations have less than $1 million USD in annual gross revenue, 5 or fewer developers, and 10 or fewer total employees.

A good place to start would be our comprehensive getting started documentation.

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