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ComboBox.SelectedIndex Property

Gets or sets the index specifying the currently selected item.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public override int SelectedIndex { get; set; }
/** @property */
public int get_SelectedIndex ()

/** @property */
public void set_SelectedIndex (int value)

public override function get SelectedIndex () : int

public override function set SelectedIndex (value : int)

Not applicable.

Property Value

A zero-based index of the currently selected item. A value of negative one (-1) is returned if no item is selected.

Exception typeCondition

ArgumentOutOfRangeException

The specified index is less than or equal to -2.

-or-

The specified index is greater than or equal to the number of items in the combo box.

This property indicates the zero-based index of the currently selected item in the combo box list. Setting a new index raises the SelectedIndexChanged event.

SelectedIndex, SelectedValue, and FormattingEnabled are related as follows:

  • If FormattingEnabled is false, SelectedIndex will not be set to -1 when SelectedValue is blank.

  • If FormattingEnabled is true, SelectedIndex will be set to -1 when SelectedValue is blank.

NoteNote:

To deselect the currently selected item, set the SelectedIndex to -1. You cannot set the SelectedIndex of a ComboBox item to -1 if the item is a data-bound item.

The following code example show how to use the FindString method and SelectedIndex property. The example is part of a complete example in the ComboBox class overview.

private void findButton_Click(object sender, System.EventArgs e) {
    int index = comboBox1.FindString(textBox2.Text);
    comboBox1.SelectedIndex = index;
}

private void findButton_Click(Object sender, System.EventArgs e)
{
    int index = comboBox1.FindString(textBox2.get_Text());
    comboBox1.set_SelectedIndex(index);
} //findButton_Click

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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