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<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="IDOverride_WebUserControl" %>
<%@ Register TagPrefix="WilcoWebControls" Namespace="Wilco.Web.UI" Assembly="Wilco.Web" %>
<div>
    <input type="text" id="userName1" runat="server" />
</div>
<div>
    <input type="text" id="userName2" runat="server" />
</div>
<div>
    <asp:Button ID="save" runat="server" Text="Login" OnClick="save_Click" />
</div>
<asp:Literal ID="msg" runat="server" EnableViewState="false" />

<WilcoWebControls:IDOverride runat="server">
    <WilcoWebControls:Override TargetControlID="userName1" />
    <WilcoWebControls:Override TargetControlID="userName2" />
</WilcoWebControls:IDOverride>