Código HTML:
<div id="cuerpo" runat="server"> <form method="get" runat="server"> <asp:label id="Label2" style="Z-INDEX: 107; LEFT: 216px; POSITION: absolute; TOP: 240px" runat="server" Width="104px">ID del Usuario</asp:label> <asp:textbox id="IdTextBox" style="Z-INDEX: 108; LEFT: 344px; POSITION: absolute; TOP: 240px" runat="server" AutoPostBack="True"></asp:textbox> <asp:label id="Label3" style="Z-INDEX: 101; LEFT: 152px; POSITION: absolute; TOP: 280px" runat="server">Introduce una password</asp:label> <asp:textbox id="PasswordTextBox1" style="Z-INDEX: 102; LEFT: 344px; POSITION: absolute; TOP: 280px" runat="server" Visible="False" TextMode="Password" Width="152px"></asp:textbox> <asp:textbox id="PasswordTextBox2" style="Z-INDEX: 103; LEFT: 344px; POSITION: absolute; TOP: 320px" runat="server" Visible="False" TextMode="Password" Width="152px"></asp:textbox><asp:label id="Label4" style="Z-INDEX: 104; LEFT: 240px; POSITION: absolute; TOP: 320px" runat="server" Width="64px">confirmala</asp:label><asp:button id="ButtonLogin" style="Z-INDEX: 105; LEFT: 368px; POSITION: absolute; TOP: 360px" runat="server" Visible="False" Width="96px" Height="32px" Text="Aceptar"></asp:button> <asp:Label id="LabelError" style="Z-INDEX: 106; LEFT: 152px; POSITION: absolute; TOP: 400px" runat="server" Width="576px" ForeColor="Red"></asp:Label> </form> </div>