Creating control events in a user control (C#) : Basics « Custom Controls « ASP.NET Tutorial

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<%@ Control Language="C#" ClassName="WebUserControl1" %>

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        this.Label1.Text = "The quick brown fox jumped over the lazy dog";
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        this.Label1.Text = "The quick brown fox clicked the button on the page";
    }
</script>

<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />