Occurs when the
SelectedIndex property has changed.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)
Visual Basic (Declaration)
Public Event SelectedIndexChanged As EventHandler
Dim instance As ListBox
Dim handler As EventHandler
AddHandler instance.SelectedIndexChanged, handler
public event EventHandler SelectedIndexChanged
public:
event EventHandler^ SelectedIndexChanged {
void add (EventHandler^ value);
void remove (EventHandler^ value);
}
/** @event */
public void add_SelectedIndexChanged (EventHandler value)
/** @event */
public void remove_SelectedIndexChanged (EventHandler value)
JScript supports the use of events, but not the declaration of new ones.
You can create an event handler for this event to determine when the selected index in the ListBox has been changed. This can be useful when you need to display information in other controls based on the current selection in the ListBox. You can use the event handler for this event to load the information in the other controls.
For more information about handling events, see Consuming Events.
The following code example demonstrates how to use the SelectedIndexChanged event to search for and select an item in a different ListBox control. The example uses the SelectedIndexChanged event to determine when the selected item in the ListBox is changed. The example code then reads the text of the item using the SelectedItem property and calls the FindString method on a different ListBox using the text returned by SelectedItem in the first ListBox. If an item is found in the other ListBox, the item is selected. This example requires that two ListBox controls, named listBox1 and listBox2, have been added to a form and that both ListBox controls contain items that are identical. The example also requires that the event-handling method defined in the example is connected to the SelectedIndexChanged event of listBox1.
Private Sub listBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles listBox1.SelectedIndexChanged
' Get the currently selected item in the ListBox.
Dim curItem As String = listBox1.SelectedItem.ToString()
' Find the string in ListBox2.
Dim index As Integer = listBox2.FindString(curItem)
' If the item was not found in ListBox 2 display a message box, otherwise select it in ListBox2.
If index = -1 Then
MessageBox.Show("Item is not available in ListBox2")
Else
listBox2.SetSelected(index, True)
End If
End Sub
private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
// Get the currently selected item in the ListBox.
string curItem = listBox1.SelectedItem.ToString();
// Find the string in ListBox2.
int index = listBox2.FindString(curItem);
// If the item was not found in ListBox 2 display a message box, otherwise select it in ListBox2.
if(index == -1)
MessageBox.Show("Item is not available in ListBox2");
else
listBox2.SetSelected(index,true);
}
private:
void listBox1_SelectedIndexChanged( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
// Get the currently selected item in the ListBox.
String^ curItem = listBox1->SelectedItem->ToString();
// Find the string in ListBox2.
int index = listBox2->FindString( curItem );
// If the item was not found in ListBox 2 display a message box,
// otherwise select it in ListBox2.
if ( index == -1 )
MessageBox::Show( "Item is not available in ListBox2" );
else
listBox2->SetSelected( index, true );
}
private void listBox1_SelectedIndexChanged(Object sender,
System.EventArgs e)
{
// Get the currently selected item in the ListBox.
String curItem = listBox1.get_SelectedItem().ToString();
// Find the string in ListBox2.
int index = listBox2.FindString(curItem);
// If the item was not found in ListBox 2 display a message box,
// otherwise select it in ListBox2.
if (index == -1) {
MessageBox.Show("Item is not available in ListBox2");
}
else {
listBox2.SetSelected(index, true);
}
} //listBox1_SelectedIndexChanged
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
.NET Framework
Supported in: 2.0, 1.1, 1.0
.NET Compact Framework
Supported in: 2.0, 1.0