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<h1>ASP.NET DropDownList Control</h1>
<hr />
<a href="aspnet_refwebcontrols.asp"><img class="navup" src="../images/up.gif" alt="Web Control Reference" border="0" /> Complete Web Control Reference</a>
<hr />
<h2>Definition and Usage</h2>
<p>The DropDownList control is used to create a drop-down list.</p>
<p>Each selectable item in a DropDownList control is defined by a ListItem element!</p>
<p><b>Tip:</b> This control supports data binding!</p>
<hr />
<h2>Properties</h2>
<table class="ex" border="1" width="100%">
<tr>
<th width="30%" align="left">Property</th>
<th width="70%" align="left">Description</th>
<th width="70%" align="left">.NET</th>
</tr>
<tr>
<td valign="top"><a href="prop_webcontrol_dropdownlist_selectedindex.asp">
SelectedIndex</a></td>
<td valign="top">The index of a selected item</td>
<td valign="top">1.0</td>
</tr>
<tr>
<td valign="top">OnSelectedIndexChanged</td>
<td valign="top">The name of the function to be executed when the index of
the selected
item has changed</td>
<td valign="top">1.0</td>
</tr>
<tr>
<td valign="top">runat</td>
<td valign="top">Specifies that the control is a server control. Must
be set to "server"</td>
<td valign="top">1.0</td>
</tr>
</table>
<h2>ListControl Standard Properties</h2>
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<tr>
<td valign="top">AppendDataBoundItems, AutoPostBack, CausesValidation,
DataTextField, DataTextFormatString, DataValueField, Items, runat,
SelectedIndex, SelectedItem, SelectedValue, TagKey, Text,
ValidationGroup, OnSelectedIndexChanged</td>
</tr>
</table>
<p>The ListControl control covers all the base functions for list controls.
Controls that inherits from this control include the CheckBoxList, DropDownList,
ListBox, and RadioButtonList controls.</p>
<p>For a full description, go to <a href="control_listcontrol.asp">ListControl
Standard Attributes.</a></p>
<h2>Web Control Standard Properties</h2>
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<tr>
<td valign="top">AccessKey, Attributes, BackColor, BorderColor,
BorderStyle, BorderWidth, CssClass, Enabled, Font, EnableTheming,
ForeColor, Height, IsEnabled, SkinID, Style, TabIndex, ToolTip, Width</td>
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</table>
<p>For a full description, go to <a href="prop_webcontrol_standard.asp">Web
Control Standard Attributes</a>.</p>
<h2>Control Standard Properties</h2>
<table class="ex" border="1" cellpadding="3" cellspacing="0" width="100%" id="table6">
<tr>
<td valign="top">AppRelativeTemplateSourceDirectory, BindingContainer,
ClientID, Controls, EnableTheming, EnableViewState, ID, NamingContainer,
Page, Parent, Site, TemplateControl, TemplateSourceDirectory, UniqueID,
Visible</td>
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</table>
<p>For a full description, go to <a href="prop_control_standard.asp">Control
Standard Attributes</a>.</p>
<h3>Examples</h3>
<p><a target="_blank" href="showasp.asp@filename=demo_dropdownlist">DropdownList</a><br />
In this example we declare one DropDownList
control in an .aspx file. Then we create an event handler for the Click event which displays some text
and the selected item, in a Label control.</p>
<hr />
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