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ASP.NET - The Hashtable Object

The Hashtable object contains items in key/value pairs.

Try it Yourself - Examples

Hashtable RadiobuttonList 1

Hashtable RadiobuttonList 2

Hashtable DropDownList

Create a Hashtable

The Hashtable object contains items in key/value pairs. The keys are used as indexes, and very quick searches can be made for values by searching through their keys.

Items are added to the Hashtable with the Add() method.

The following code creates a Hashtable named mycountries and four elements are added:

Data Binding

A Hashtable object may automatically generate the text and values to the following controls:

• asp:RadioButtonList
• asp:CheckBoxList
• asp:DropDownList
• asp:Listbox

To bind data to a RadioButtonList control, first create a RadioButtonList control (without any asp:ListItem elements) in an .aspx page:

Then add the script that builds the list:

Then we add a sub routine to be executed when the user clicks on an item in the RadioButtonList control. When a radio button is clicked, a text will appear in a label:

Note: You cannot choose the sort order of the items added to the Hashtable. To sort items alphabetically or numerically, use the SortedList object.