Assignment 6 – Phone book

Objective: To learn to use list boxes and arrays.

Problem description:

To create a phone book (like the one below) that can perform the following functions:

1. Add/Update: The user enters a name (necessary) and a phone number (not necessary) and clicks Add/Update to add/update the entry in the phone book. Condition: The name cannot be an empty string “”.

2. Search : The user enters a name and clicks Search to search for the telephone number corresponding to the name. Conditions: If there is a telephone number corresponding to the name, then it is displayed in the Tel No textbox. If the name is found but there is no corresponding phone number a message “Number unknown” is displayed else if the name is not found in the phone book, a message “No such entry” is displayed.

3. Clicking on an entry in the list box should display that entry in the name textbox and clear the tel no text box.

Object Type	Object Name	Function
Label	LblName	Displays “Name”
Label	LblTel	Displays “Tel No”
Textbox	TxtName	Takes the name input from the user
Textbox	TxtTel	Takes the tel no from the user
Button	BtnSearch	When clicked, searches for the tel no corresponding to the name in txtName
Button	BtnAddUpdate	Adds/Updates the phone book with the entry provided by the user
Listbox	ListNames	Displays the list of all the names in the phone book currently.