Add the following Scripts
Add the Following Scripts
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/css/bootstrap.min.css"
rel="stylesheet" type="text/css" />
<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.3/js/bootstrap.min.js"></script>
<link href="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/css/bootstrap-multiselect.css"
rel="stylesheet" type="text/css" />
<script src="http://cdn.rawgit.com/davidstutz/bootstrap-multiselect/master/dist/js/bootstrap-multiselect.js"
type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$('[id*=lsNames]').multiselect({
includeSelectAllOption: true
});
});
</script>
<asp:ListBox ID="lsNames" runat="server" SelectionMode="Multiple">
<asp:ListItem Text="a" Value="1" />
<asp:ListItem Text="b" Value="2" />
<asp:ListItem Text="c" Value="3" />
<asp:ListItem Text="d" Value="4" />
<asp:ListItem Text="e" Value="5" />
</asp:ListBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
on button click
write the following code
string message = "";
foreach (ListItem item in lsNames.Items)
{
if (item.Selected)
{
message += item.Text + " " + item.Value + "\\n";
}
}
ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert('" + message + "');", true);
Output