<!DOCTYPE html>
<html>
<body>
<script runat="server">
Sub ClickCheck(sender As Object, e As EventArgs)
lbl1.Text = "Selected Item(s):<br>"
Dim i As Integer
For i = 0 To cb1.Items.Count - 1
If cb1.Items(i).Selected Then
lbl1.Text = lbl1.Text & cb1.Items(i).Text & "<br>"
End If
Next
End Sub
</script>
<form method="post" runat="server">
<asp:CheckBoxList id="cb1" AutoPostBack="True"
OnSelectedIndexChanged="ClickCheck" runat="server">
<asp:ListItem Value="Item 1" />
<asp:ListItem Value="Item 2" />
<asp:ListItem Value="Item 3" />
<asp:ListItem Value="Item 4" />
</asp:CheckBoxList>
<br>
<asp:label id="lbl1" runat="server"/>
</form>
</body>
</html>