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The WinForms multi select combobox control lets users select multiple items from a dropdown using the checkboxes next to each item. It also supports confirmation buttons (OK and Cancel) in the dropdown, similar to Excel.


Built-in checkboxes allow users to select more than one item in the ComboBox control with complete keyboard support.

winforms combobox multiselect mode

Select all (check all) option

Select all the items in the dropdown with just one click of the select-all checkbox.

select all option in winforms combobox

Custom delimiter character

Customized delimiters (separators) separate the selected items displayed in the ComboBox.

custom delimiter character in winforms multiselect combobox

  • Freeze the header and footer at the top and bottom of the dropdown list.
  • Load any UI control as the header of the dropdown. This helps users perform customized operations like search and filter in the dropdown itself.

Search textbox in dropdown in winforms combobox

Excel-like selection

  • Perform selection after user confirmation using OK and Cancel buttons, similar to in Excel.
  • Hide the OK and Cancel buttons from the dropdown.

excel like selection 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 the readability of the content. It is also possible to set the item height conditionally.

winforms combobox item height


Selected item(s) from a predefined list will be added as tokens to the combobox.

winforms combobox tokensupport


Provide hint or information to user using Tooltip. This hint will be displayed when user mouse over the control. You can customize the appearance of the tooltip as required.

winforms combobox shows tooltip

Appearance style

Customize the appearance of the ComboBox edit control and dropdown. You can customize the appearance based on data conditionally. Some customizable aspects:

  • Background color
  • Text color
  • Checkbox style
  • OK and Cancel buttons style
  • Font.

winforms multiselect combobox styling


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