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The WinForms ComboBox (multiselect combobox) control allows users to type a value, choose an item, or choose multiple items. Any UI control can be loaded as the header of the dropdown. Users can perform customized actions like search and filter in the dropdown. The control’s rich feature set includes autocomplete, sorting, watermark text, appearance customization, and more.

Data binding

The WinForms ComboBox control has data binding support to work out-of-the-box with all the popular data sources like IEnumerable (IList, IBindingList, ObservableCollection) and data tables. It also supports sorting and filtering. Data can be shown based on the display member and value member. The control also allows users to bind the data source at the designer level.

winforms combobox data binding illustration


  • The WinForms ComboBox control provides support to select an item or multiple items from the dropdown.
  • Users can easily select multiple items by using the checkboxes in the dropdown.
  • The control displays a confirmation button in the dropdown. It supports customization of the selected item’s appearance.

Autocomplete (filter by typing)

winforms combobox showing editing with suggestions in dropdown


  • A list of items is displayed in the dropdown based on the text typed in the editor control.
  • Users can perform case-sensitive autocompletion.
  • Users can filter suggested items using starts with or contains.

winforms combobox showing editing with appended text


  • The control completes the user-typed word with suggestion text to help users search for correct items easily.
  • Users select an item from the dropdown list based on the appended word in the edit control.

winforms combobox showing editing with suggestion and appended text

Suggest and append

  • This combines the operations of suggestion and append.
  • Users can perform case-sensitive autocompletion.
  • Control completes a word that the user types with suggestion text and filters the suggestions. Users can choose an item from the filtered list.


  • Sort the items in the dropdown in either ascending or descending order.
  • Sort items by writing your own custom logic.

winforms combobox shows sorted data in descening order

winforms combobox shows filtered data


The WinForms ComboBox allows users to filter data. For example, items in the dropdown can be filtered based on user input.


A watermark provides a hint to users about the data to be selected from the listed values.

winforms combobox shows watermark text

Appearance style

winforms combobox styling


Customize the appearance of the edit control and dropdown list by setting the:

  • Background color
  • Text color
  • Font

winforms combobox conditional styling

Conditional styling

Customize the appearance of the dropdown list items based on the data.

winforms combobox shows image in dropdown

Images in dropdown

Users can load an image to each list item in the dropdown. Images can also be aligned with the text.

winforms combobox shows custom drawing in dropdown

Custom drawing

Make a custom drawing for every list item in the WinForms Combobox control.

Customize the dropdown position to load the pop-up where needed.

winforms combobox dropdown position

winforms combobox clear button

Clear button

Show or hide the clear button, which is used to clear the editor value and selection.

Built-in themes

The WinForms ComboBox control provides Office 2016 theme support to adapt the control to the rest of a business application. The following Office 2016 themes are supported:

  • Colorful
  • Black
  • Dark Gray
  • White

Office 2016 black theme in winforms combobox

winforms combobox item height

Item height

Users can adjust (auto fit) the item height in the dropdown based on the content of the item to enhance readability. It is also possible to set the item height conditionally.

  • Change the height and width of the dropdown.
  • Resize the dropdown dynamically using an intuitive resizing thumb.

winforms combobox dropdown sizing


Localize all the static default strings in the WinForms ComboBox control to any supported language.

localization in winforms combobox

right to left mode in winforms combobox

Right to left (RTL)

The control supports right-to-left (RTL) rendering for users working in right-to-left languages like Hebrew, Arabic, or Persian.

UI automation

The WinForms ComboBox control is compatible with Coded UI and UFT (formerly QTP) automation tools to automate applications.

winforms combobox ui automation illustration

WinForms ComboBox Code Example

Easily get started with the WinForms ComboBox using a few simple lines of C# code example as demonstrated below. Also explore our WinForms ComboBox Example that shows you how to configure a ComboBox in WinForms.

using Syncfusion.WinForms.ListView;
namespace WinFormsApp1
    public partial class Form1 : Form
        public Form1()
            List<string> usStates = new List<string>();
            SfComboBox sfComboBox = new SfComboBox();
            sfComboBox.Size = new Size(180, 24);
            sfComboBox.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            sfComboBox.DataSource = usStates;


Frequently Asked Questions

The Syncfusion WinForms ComboBox provides the following features:

  • Multiple item selection made easy with intuitive check box selection.
  • Search and filter items by placing an intuitive UI at the top of the dropdown.
  • A rich feature set that includes autocompletion, check box selection, sorting, watermark text, and appearance customization.
  • Work with a simple configuration and API.
  • One of the best WinForms ComboBox in the market that offers feature-rich UI to interact with the software.
  • Use touch-friendly and responsive features.
  • Learn quickly and get started with WinForms ComboBox using its extensive demos and documentation.

You can find our WinForms ComboBox demo on GitHub location.

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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