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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)

[BrowsableAttribute(false)]
public override int SelectedIndex { get; set; }

Property Value

Type: System.Int32
A zero-based index of the currently selected item. A value of negative one (-1) is returned if no item is selected.

ExceptionCondition
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:

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;
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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