ASP.NET SelectedIndex property
ListControl control Reference Manual Definition and Usage
SelectedIndex property represents the number of index entries selected in the list.
Examples
The following examples get RadioButtonList control of a ListItem index:
<script runat="server">
Sub Change(obj As Object, e As EventArgs)
Response.Write("Selected index: " & rb1.SelectedIndex)
End Sub
</script>
<form runat=server>
<asp:RadioButtonList id="rb1" AutoPostBack="true"
runat="server" OnSelectedIndexChanged="Change">
<asp:ListItem Text="Item 1" />
<asp:ListItem Text="Item 2" />
</asp:RadioButtonList>
</form>
Sub Change(obj As Object, e As EventArgs)
Response.Write("Selected index: " & rb1.SelectedIndex)
End Sub
</script>
<form runat=server>
<asp:RadioButtonList id="rb1" AutoPostBack="true"
runat="server" OnSelectedIndexChanged="Change">
<asp:ListItem Text="Item 1" />
<asp:ListItem Text="Item 2" />
</asp:RadioButtonList>
</form>
The demonstration >>
ListControl control Reference Manual