Selection mode of asp:ListBox (VB) : ListBox « ASP.net Controls « ASP.NET Tutorial
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<%@ Page Language="vb" Explicit="true" Strict="true" %>
<script language="vb" runat="Server">
Public Sub Verify(sender As Object, e As EventArgs)
Dim lstItem As ListItem
If CountryListBox.SelectedIndex <> -1 Then
OutputLabel.Text = "You selected: "
If CountryListBox.SelectionMode = ListSelectionMode.Single Then
OutputLabel.Text += "<b>" & CountryListBox.SelectedItem.Text & "</b>"
Else
For Each lstItem In CountryListBox.Items
If lstItem.Selected Then
OutputLabel.Text += "<b>" & lstItem.Text & "</b>, "
End If
Next
End If
Else
OutputLabel.Text = "You didn't selected any country!"
End If
End Sub
</script>
<html>
<head>
<title></title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<asp:ListBox ID="CountryListBox" Runat="server" SelectionMode="Multiple">
<asp:ListItem Value="1">United States</asp:ListItem>
<asp:ListItem Value="2">United Kingdom</asp:ListItem>
<asp:ListItem Value="3">China</asp:ListItem>
<asp:ListItem Value="4">India</asp:ListItem>
</asp:ListBox><br>
<asp:Button ID="SubmitButton" Runat="server" Text="Submit" OnClick="Verify"></asp:Button>
<asp:Label ID="OutputLabel" Runat="server"></asp:Label>
</form>
</body>
</html>