15.3 (Using ComboBoxes) Write an app that displays the names of 15 states in a
ComboBox. When an item is selected from the
ComboBox, remove it.
15.4 (Using ComboBoxes and ListBoxes) Modify your solution to the previous exercise to add a
ListBox. When the user selects an item from the
ComboBox, remove the item from the
ComboBox and add it to the
ListBox. Your program should check to ensure that the
ComboBox contains at least one item. If it does not, display a message, using a message box, then terminate program execution when the user dismisses the message box.
15.5 (Sorting Strings) Write an app that allows the user to enter
strings in a
string input is added to a
ListBox. As each
string is added to the
ListBox, ensure ...