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<h1>ASP.NET - The SortedList Object</h1>
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<p class="intro">The SortedList object combines the features of both the ArrayList
object and the Hashtable object.</p>
<hr />
<h2>Examples</h2>
<p><a target="_blank" href="showasp.asp@filename=demo_sortedlist_radio1">Example 1 - SortedList RadioButtonList</a></p>
<p><a target="_blank" href="showasp.asp@filename=demo_sortedlist_radio2">Example 2 - SortedList RadiobuttonList</a></p>
<p><a target="_blank" href="showasp.asp@filename=demo_sortedlist_drop1">Example 3 - SortedList DropDownList</a></p>
<hr />
<h2>The SortedList Object</h2>
<p>The SortedList object contains items in key/value pairs. A SortedList object automatically
sort the items in alphabetic or numeric order.</p>
<p>Items are added to the SortedList with the Add() method. A SortedList
can be sized to its final size with the TrimToSize() method.</p>
<p>The following code creates a SortedList 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 SortedList
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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<h2>Data Binding</h2>
<p>A SortedList 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>
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<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 SortedList
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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<pre><form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" /><br /></form></pre>
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<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 SortedList
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>
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