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<h1>ASP.NET - The Hashtable Object</h1>
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<p class="intro">The Hashtable object contains items in key/value pairs.</p>
<hr />
<h2>Examples</h2>
<p><a target="_blank" href="showasp.asp@filename=demo_hashtable_radio1">Example 1 - Hashtable RadioButtonList</a></p>
<p><a target="_blank" href="showasp.asp@filename=demo_hashtable_radio2">Example 2 - Hashtable RadiobuttonList</a></p>
<p><a target="_blank" href="showasp.asp@filename=demo_hashtable_drop1">Example 3 - Hashtable DropDownList</a></p>
<hr />
<h2>Create a Hashtable</h2>
<p>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.</p>
<p>Items are added to the Hashtable with the Add() method.</p>
<p>The following code creates a Hashtable named
mycountries and four elements are added:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><script runat="server">
Sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
end if
end sub
</script></pre>
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<hr />
<h2>Data Binding</h2>
<p>A Hashtable object may automatically generate the text and values to the following controls:</p>
<ul>
<li>asp:RadioButtonList</li>
<li>asp:CheckBoxList</li>
<li>asp:DropDownList</li>
<li>asp:Listbox</li>
</ul>
<p>To bind data to a RadioButtonList control, first create a RadioButtonList control (without
any asp:ListItem elements) in an .aspx page:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><html>
<body></pre>
<pre><form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" /><br /></form></pre>
<pre></body>
</html></pre>
</td></tr>
</table>
<p>Then add the script that builds the list:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
rb.DataSource=mycountries<br /> rb.DataValueField="Key"<br /> rb.DataTextField="Value"<br /> rb.DataBind()
end if
end sub
</script></pre>
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<body></pre>
<pre><form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" /><br /></form></pre>
<pre></body>
</html></pre>
</td></tr>
</table>
<p>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:</p>
<table class="ex" border="1" width="100%">
<tr><td>
<pre><script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
rb.DataSource=mycountries
rb.DataValueField="Key"
rb.DataTextField="Value"
rb.DataBind()
end if
end sub</pre>
<pre>sub displayMessage(s as Object,e As EventArgs)
lbl1.text="Your favorite country is: " & rb.SelectedItem.Text
end sub
</script></pre>
<pre><html>
<body></pre>
<pre><form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
<p><asp:label id="lbl1" runat="server" /></p>
</form></pre>
<pre></body>
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</td></tr>
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<p><b>Note:</b> You cannot choose the sort order of the items
added to the Hashtable. To sort items
alphabetically or numerically, use the SortedList object.</p>
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