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Code: Determining the Selected Item in a ListBox Control (Visual C#)

Visual Studio .NET 2003

This example determines which item has been selected in a Windows Forms ListBox control.

Example

private void Form1_Load(object sender, System.EventArgs e)
{
    listBox1.Items.Add("One");
    listBox1.Items.Add("Two");
    listBox1.Items.Add("Three");
}

private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
    if ((string)listBox1.SelectedItem == "Two")
        MessageBox.Show((string)listBox1.SelectedItem);
}

Compiling the Code

This example requires:

  • A form named Form1 with a ListBox control named listBox1. Set Form1's Load event handler to Form1_Load. Set listBox1's SelectedIndexChanged event handler to listBox1_SelectedIndexChanged.
Note   This can also be used with a ComboBox control by substituting a ComboBox control named comboBox1 for the ListBox control and changing the code from listBox1 to comboBox1.

See Also

Windows Forms Example Topics

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