Difference between listbox and combo box.

List Box :  
1. Occupies more space but shows more than one value. 
2. We can select multiple items. 
3. we can use checkboxes with in the list box. 
 
Combo Box: 
 
1. Occupies less space but shows only one value for visibility 
2. Multiple select is not possible 
3. can't use checkboxes within combo boxes 
 

  Combo Box

 1) It is Combination of TextBox and ListBox

 2) Three Styles (i)Simple combo (ii) DropDown (iii) DropDown List

The main Difference between listbox and combo box.We cann't write any thingon thelistbox but Combo box we can write.

Listbox:

1) Does not contain a text box to write an item, Item is added using Additem method only


2) Always shows all item in the list

3) Can contain a checkbox in the list

ComboBox:

1) Can contain a text box to write an item, Item is added also using Additem method only


2) Style property define if the item in the list have to be always shown

3) No checkbox is used

we can select Multiple option in Listbox whereas only one option we can select from the collection of data in Combobox..

list box:
1)does not contain a text box to write an item.
2)always shows more than one item.
3)we can select one item from multiple items in the list box.
4)contain a check box with in the list box.

combo box:
1)contain a text box.
2)always shows one item.
3)selection is not available.
4)does not contain a checkbox.

Listbox is a tool provided by visual basic that list the number of items in a specific manner and provides a facility to select one of the entry from the list only using drop down list,there are some extensions to listbox like Dir listbox,File listbox,etc.

Combobox is a combination of textbox and listbox,i.e,you can select the one of the required entity from the list either by typing in the box or by using drop down list.