C# how can I make a listbox dropdown like a combobox does?

Question

How can I make a listbox dropdown like a combobox?

Or is it possible to configure a combobox so that the user can't add values but rather only select from the available list of values?

This is for a desktop application.

Answer 1

The ComboBox control has a DropDownStyle property used to set this. Set it to DropDownList.

Answer 2

Set the DropDownStyle to DropDownList:

Specifies that the list is displayed by clicking the down arrow and that the text portion is not editable. This means that the user cannot enter a new value. Only values already in the list can be selected. The list displays only if AutoCompleteMode is Suggest or SuggestAppend.

like:

DropDownStyle = DropDownList;