<script runat="server">
Sub btClick1(obj As Object, e As EventArgs)
lblMsg.Text="OnClick script: Hello!"
End Sub
</script>
<!DOCTYPE html>
<html>
<body>
<form runat="server">
<asp:LinkButton OnClick="btClick1" OnClientClick="btClick2()"
Text="Click Me" runat="server" />
<br>
<asp:label id="lblMsg" runat="server" />
</form>
<script type="text/javascript">
function btClick2()
{
return confirm('OnClientClick script: Press OK to continue.');
}
</script>
</body>
</html>