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The WinForms ComboBox control allows users to type a value or choose an item or multiple items from a list of predefined options. Any UI control can be loaded as the header at the top of the drop-down to perform customized actions like search and filter. It’s rich feature set includes autocompletion, sorting, watermark text, and appearance customization.

Data binding

Combobox has built-in support to load data IEnumerable data sources such as IList, IBindingList, and more. It also supports sorting and filtering. The data can be shown based on display member and value member.

windows forms combobox data binding


windows forms combobox showing editing with suggestions in drop down


Suggested text can be appended to the original text or displayed in a drop-down list for users to choose from.

windows forms combobox showing editing with appended text


Complete the word the user is typing from the suggestion text. This helps end users search for the correct items easily.

windows forms combobox showing editing with suggestion and appended text

Suggest and append

Complete the word that the user types from suggestion text and filter the suggestions. Users can choose one item from the filtered list.


Watermarks help prompt users by providing additional hints about the data that needs to be entered into the text box.

windows forms combobox showing watermark text

Appearance formatting

appearance customization in windows forms combobox


Supports loading an image next to each list item.

conditional formatting in windows forms combobox

Conditional styling

Supports applying styles to each item based on defined conditions.

custom drawing in windows forms combobox

Custom drawing

Supports making a custom drawing for every list item.


mutiple selection in windows forms combobox


Provides an efficient way to make a multiselection list.

select all option in windows forms combobox

Select all

Supports choosing all the items in a multiselect combo box.

showing tooltip in windows forms combobox


Supports displaying tooltips to view all selected items in a multiselect combo box.

delimiter character of multi selection mode in windows forms combobox

Custom delimiter character

Supports customizing the selected items separator for a multiselect combo box.

Freeze a header and footer at the top and bottom of the drop-down list in combobox. The header and footer can be customized by adding the text, image or custom control.


localization of windows forms combobox


Static text in the drop-down list can be localized to any desired language.

right to left mode in windows forms combobox

Right to left

Supports RTL text. The alignment of the combo box can also be set to left-to-right or right-to-left.

Supports resizing the drop-down container using a resize gripper placed at the bottom of the pop-up control.


The combo box supports built-in Office 2016 themes:

  • Colorful
  • Black
  • Dark Gray
  • White


Supports various accessibility features to make applications available to a wide variety of users.


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