A combo box is a list of multiple values a user can select. Sometimes we refer to them as dropdown lists. When you click on it a list of value pops down and you can choose an option. They are very commonly seen on computers. To create them you use the Combo Box control in Visual BASIC.
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It's an interface element in Microsoft Visual Studio and Borland Builder (Codegear). It's a dropping down list of items which you can choose and edit.
combo box
A list box displays a list from which the user may make a selection. The default behaviour is to permit a single selection, but multiple selections are also permitted by changing the SelectionMode accordingly.A combo box combines a list box with a text box, but the list is limited to single selections only. Changing the DropDownStyle alters the behaviour of the combo box.The default style is DropDown, which permits the user to enter text that is not contained in the list, therefore the list provides suggested input for the user (and can be used to auto-complete the input text). The user can also click the drop down arrow to expose the list and make a direct selection as they would from a list.When the style is Simple, the list is exposed at all times, but otherwise behaves as per the default mode. But in DropDownList mode, the user is limited to only those items in the list.To sum up, if you need multiple-selections, then you must use a list box. For single selections, you can use either. If space is limited, a combo box is better, but if the list must be exposed then a list box will be smaller. However, if user-defined input is permitted, then you must use a combo box. A text box would also be an option, but the combo box also allows suggestedinput.
LISTBOX CONTROLCOMBOX CONTROLA LISTBOX CONTROL displays a list of items from which theuser can select one or more. If the number of items exceeds the number that can be displayed, a scroll bar is automatically added to the List Box control.a list box is appropriate when you want to limit input to what is on the listchoices not on the list can be typed in this field.A COMBOX CONTROL combines the features of a text box and a list box. This control allows the user to select an item either by typing text into the combo box, or by selecting it from the list.a combo box is appropriate when there is a list of suggested choicesA combo box contains an edit field.
You could use the SELECT and OPTION tags to create a list or a combo box, ensuring that you don't allow the multiple attribute to be active.
Transport waste and storm water if it is a combo system