aspx网页相对布局

网页的布局

<body bgcolor="#b6b7bc">
    <form id="form1" runat="server">
    <div style="height: 600px; background: url(Image/login.jpg) no-repeat center center;">
        <div style="width: 50%; position: relative; left: 30%; top: 55%; right: 50%; bottom: 50%;">
            <asp:Label ID="m_DevedCodeLabel" runat="server" Text="设备码："></asp:Label>
            <asp:TextBox ID="m_DevedCodeTextBox" runat="server" ReadOnly="True" Width="320px"></asp:TextBox>
            <br />
            <br />
            <asp:Label ID="m_MessageLabel" runat="server" ForeColor="Red" Visible="False"></asp:Label>
            <br />
            <asp:Button ID="m_OKButton" runat="server" Text="提交注册申请" />
        </div>
    </div>
    </form>
</body>

 异步调用：

 <asp:ScriptManager ID="ScriptManager1" runat="server">
            </asp:ScriptManager>
            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
                    <asp:Label ID="m_MessageLabel" runat="server" ForeColor="Red" Visible="False"></asp:Label>
                    <br />
                    <asp:Button ID="m_OKButton" runat="server" Text="提交注册申请" OnClick="m_OKButton_Click" />
                </ContentTemplate>
            </asp:UpdatePanel>