Starting out with Visual C# (4th Edition)
Starting out with Visual C# (4th Edition)
4th Edition
ISBN: 9780134382609
Author: Tony Gaddis
Publisher: PEARSON
Question
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Chapter 4, Problem 9AW
Program Plan Intro

List boxes:

List box controls help to show the list of items which enables the user to choose an item from the list.

  • The user may choose one of the items from the list, causing the item to appear selected at runtime.
  • The selected items will be displayed on ListBox control.

Get the items from ListBox control:

The item which is selected by user from ListBox is stored into ListBox’s SelectedItem property.

Steps to determine the selected item in Listbox:

If anyone tries to get the value when ListBox’s SelectedItem is empty, then it will occur with an exception.

  • Always ensure that item is selected before reading an item in the SelectedItem. The items stored in ListBox with index value.
  • This is done by “SelectedIndex” property.
  • The item index is stored into SelectedIndex property.
    • The index is a number to determine the position of Items in ListBox.
    • If first item means index value is “0”, second means “1”, and so on. If there is no item in ListBox, then the index value is set to “-1”.
  • The following example code checks whether the SelectedIndex property is “-1” or not.

  if(courseListBox.SelectionIndex != -1)

  {

    selectedProduct = productListBox.SelectedItem.ToString();

  }

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Chapter 4 Solutions

Starting out with Visual C# (4th Edition)

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