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WebForms HTML WebForms Controls WebForms ValidationASP.NET DropDownList Control
Web Server Controls
Definition and Usage
The DropDownList control is used to create a drop-down list.
Each selectable item in a DropDownList control is defined by a ListItem element!
Tip: This control supports data binding!
Properties
| Property | Description | .NET |
|---|---|---|
| SelectedIndex | The index of a selected item | 1.0 |
| OnSelectedIndexChanged | The name of the function to be executed when the index of the selected item has changed | 1.0 |
| runat | Specifies that the control is a server control. Must be set to "server" | 1.0 |
ListControl Standard Properties
AppendDataBoundItems, AutoPostBack, CausesValidation,
DataTextField, DataTextFormatString, DataValueField, Items, runat,
SelectedIndex, SelectedItem, SelectedValue, TagKey, Text,
ValidationGroup, OnSelectedIndexChanged
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.
For a full description, go to ListControl Standard Attributes.
Web Control Standard Properties
AccessKey, Attributes, BackColor, BorderColor,
BorderStyle, BorderWidth, CssClass, Enabled, Font, EnableTheming,
ForeColor, Height, IsEnabled, SkinID, Style, TabIndex, ToolTip, Width
For a full description, go to Web Control Standard Attributes.
Control Standard Properties
AppRelativeTemplateSourceDirectory, BindingContainer,
ClientID, Controls, EnableTheming, EnableViewState, ID, NamingContainer,
Page, Parent, Site, TemplateControl, TemplateSourceDirectory, UniqueID,
Visible
For a full description, go to Control Standard Attributes.
Example
DropdownList
Declare one DropDownList control in an .aspx file. Then create an event handler for the Click event which displays some text and the selected item, in a Label control.
Web Server Controls
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