<script runat="server">
Sub SubmitBtn(obj As Object, e As EventArgs)
lblMsg.Text = "Submitted using the ASP.NET postback mechanism."
End Sub
</script>
<!DOCTYPE html>
<html>
<body>
<form runat="server">
Click the button:
<asp:button id="Button1" Text="Submit" onclick="SubmitBtn"
UseSubmitBehavior="FALSE" runat="server"/>
<br>
<asp:label id="lblMsg" runat="server"/>
</form>
</body>
</html>