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.NET and JavaScript UI Controls
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SelectedIndex Property

Gets/sets the index of the current SelectedItem. Available only at runtime.
Syntax
'Declaration
 
Public Property SelectedIndex As Integer
public int SelectedIndex {get; set;}
Remarks

Setting the SelectedIndex property results in the SelectedItem property being set to the item at that ordinal position in the Items collection.

Note: When the HasMRUList property is True, and the dropdown list contains MRU items, the SelectedIndex property represents the index of the item in the Items collection to which it corresponds, not the index in the dropdown list. Note: A setting of -1 has special meaning in that when the SelectedIndex property is set to -1, the current selection is cleared. In the case where the DropDownStyle property is set to DropDownList, this results in the control's Text property being cleared as well.

Example
This sample initializes the items collection of an UltraComboEditor. It then initializes some of the display and behavior properties such as MRU, Item and individual item appearances, autocomplete.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    'Add 8 items to the combo
    Me.UltraComboEditor1.Items.Add(1, "One")
    Me.UltraComboEditor1.Items.Add(2, "Two")
    Me.UltraComboEditor1.Items.Add(3, "Three")
    Me.UltraComboEditor1.Items.Add(4, "Four")
    Me.UltraComboEditor1.Items.Add(5, "Five")
    Me.UltraComboEditor1.Items.Add(6, "Six")
    Me.UltraComboEditor1.Items.Add(7, "Seven")
    Me.UltraComboEditor1.Items.Add(8, "Eight")

    ' This combo should always be in edit mode, 
    Me.UltraComboEditor1.AlwaysInEditMode = True

    ' Turn on auto-complete for Internet Explorer type auto completion
    Me.UltraComboEditor1.AutoComplete = True

    ' Office XP look and feel.
    Me.UltraComboEditor1.DisplayStyle = Infragistics.Win.EmbeddableElementDisplayStyle.OfficeXP

    ' Assign a shared image and forecolor to each element.
    Me.UltraComboEditor1.ItemAppearance.Image = Me.Icon.ToBitmap()
    Me.UltraComboEditor1.ImageTransparentColor = Color.FromArgb(192, 192, 192)
    Me.UltraComboEditor1.ItemAppearance.ForeColor = Color.White

    ' Assign individual backColors to each element

    Dim baseColorIndex As Integer = 255 / Me.UltraComboEditor1.Items.Count
    Dim i As Integer

    For i = 0 To Me.UltraComboEditor1.Items.Count - 1
        Me.UltraComboEditor1.Items(i).Appearance.BackColor = Color.FromArgb(100, 100, baseColorIndex + (baseColorIndex * i))
    Next i


    Me.UltraComboEditor1.MaxDropDownItems = 6
    Me.UltraComboEditor1.HasMRUList = True
    Me.UltraComboEditor1.SelectedIndex = 3
    Me.UltraComboEditor1.SortStyle = Infragistics.Win.ValueListSortStyle.DescendingByValue

End Sub
private void Form1_Load(object sender, System.EventArgs e)
{

	// Add 8 items to the combo
	this.ultraComboEditor1.Items.Add(1,"One");
	this.ultraComboEditor1.Items.Add(2,"Two");
	this.ultraComboEditor1.Items.Add(3,"Three");
	this.ultraComboEditor1.Items.Add(4,"Four");
	this.ultraComboEditor1.Items.Add(5,"Five");
	this.ultraComboEditor1.Items.Add(6,"Six");
	this.ultraComboEditor1.Items.Add(7,"Seven");
	this.ultraComboEditor1.Items.Add(8,"Eight");

	// This combo should always be in edit mode, 
	this.ultraComboEditor1.AlwaysInEditMode = true;

	// Turn on auto-complete for Internet Explorer type auto completion
	this.ultraComboEditor1.AutoComplete = true;

	// Office XP look and feel.
	this.ultraComboEditor1.DisplayStyle = Infragistics.Win.EmbeddableElementDisplayStyle.OfficeXP;

	// Assign a shared image and forecolor to each element.
	this.ultraComboEditor1.ItemAppearance.Image = this.Icon.ToBitmap();
	this.ultraComboEditor1.ImageTransparentColor = Color.FromArgb(192,192,192);
	this.ultraComboEditor1.ItemAppearance.ForeColor = Color.White;

	// Assign individual backColors to each element
	int baseColorIndex = 255 / this.ultraComboEditor1.Items.Count;

	for(int i = 0; i < this.ultraComboEditor1.Items.Count; i++)
	{
		this.ultraComboEditor1.Items[i].Appearance.BackColor = Color.FromArgb(100,100,baseColorIndex  + (baseColorIndex * i));
	}


	this.ultraComboEditor1.MaxDropDownItems = 6;
	this.ultraComboEditor1.HasMRUList = true;
	this.ultraComboEditor1.SelectedIndex = 3;
	this.ultraComboEditor1.SortStyle = Infragistics.Win.ValueListSortStyle.DescendingByValue;

}
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also