WinForms ComboBox | Multiselect ComboBox

Overview

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

Data binding

The WinForms ComboBox has data binding support to work out-of-the-box with all the popular data sources like IEnumerable (IList, IBindingList, ObservableCollection, and more) and DataTable. It also supports sorting and filtering. Data can be shown based on the display member and value member.

winforms combobox data binding illustration

Selection

The WinForms ComboBox provides support to select an item or multiple items from the dropdown.
Users can easily select multiple items by using the intuitive checkbox in the dropdown.
Supports multiple selection and a confirmation button in the dropdown. Also supports customization of the selected item’s appearance.

Learn more about multiselect

Autocomplete (filter by typing)

winforms combobox showing editing with suggestions in dropdown

Suggestion

Displays the list of items in the dropdown based on the typed text in the edit control.
Users can perform case-sensitive autocompletion.
Built-in support to suggest items using starts with or contains.

winforms combobox showing editing with appended text

Append

Completes the user-typed word from the suggestion text to help users search for correct items easily.
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

Combined operation of suggestion and append.
Users can perform case-sensitive autocompletion.
Completes a word that the user types based on the suggestion text and filters the suggestions. Users can choose an item from the filtered list.

Sort

Sort the items in the dropdown either in ascending or descending order.
Users can sort items by writing their own custom logic.

winforms combobox shows sorted data in descening order

Filtering

The WinForms ComboBox allows users to filter data. Users can also filter items with their own custom logic.

winforms combobox shows filtered data

Watermark

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

winforms combobox shows watermark text

Appearance style

winforms combobox styling

Styling

Customize the appearance of the edit control and dropdown list.

Background color
Text color
Font and more.

winforms combobox conditional styling

Conditional styling

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

Conditional styling documentation

winforms combobox shows image 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

Supports making a custom drawing for every list item.

Built-in themes

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

Colorful
Black
Dark Gray
White

Office 2016 black theme in winforms combobox

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.

Item height documentation

winforms combobox item height

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

winforms combobox dropdown sizing

Localization

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

Localization documentation

localization in winforms combobox

Right to left (RTL)

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

right to left mode in winforms combobox

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

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Advanced WinForms ComboBox Control

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Overview

Data binding

Selection