ASP.NET - Event Handlers

<%@ Page Language="VB" %>
<script runat="server">

    Sub Button1_OnClick(sender as Object, e As EventArgs)
        ................
    End Sub
</script>
<form runat="server">
<asp:Button id="Button1" onclick="Button1_OnClick" runat="server" Text="Button"></asp:Button>
</form>

<%@ Page Language="C#" %>
<script runat="server">

    void Button1_OnClick(Object sender, EventArgs e)
    {
        ................
    }
</script>
<form runat="server">
<asp:Button id="Button1" onclick="Button1_OnClick" runat="server" Text="Button"></asp:Button>
</form>

<%@ Page Language="VB" %>
Sub Button1OnClick(sender as Object, e As EventArgs) Handles Button1.Click

End Sub
</script>
<form runat="server">
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
</form>