controls/Login.ascx

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<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Login.ascx.cs" Inherits="controls_Login" %>
<asp:Label ID="LbUsername" runat="server" Text="用户名："></asp:Label>
    <asp:TextBox ID="UserName" runat="server" Width="85px"></asp:TextBox>
    <asp:Label ID="LbPassWord" runat="server" Text="密码："></asp:Label>
    <asp:TextBox ID="PassWord" runat="server" Width="85px" TextMode="Password"></asp:TextBox>
    &nbsp;<asp:Button ID="LoginBtn" runat="server" Text="登录" Height="27px" 
        onclick="LoginBtn_Click" Width="46px" />
&nbsp;
    <asp:LinkButton ID="Register" runat="server" Font-Underline="False" 
        PostBackUrl="~/Register.aspx">注册</asp:LinkButton>
<br />
图书查找<asp:TextBox ID="SearchTb" runat="server" Width="90px"></asp:TextBox>
    <asp:DropDownList ID="SearchDdb" runat="server" 
        Height="20px" Width="63px">
        <asp:ListItem Selected="True">书名</asp:ListItem>
        <asp:ListItem>图书ID</asp:ListItem>
        <asp:ListItem>作者</asp:ListItem>
    </asp:DropDownList>
<asp:Button ID="SeachBtn" runat="server" onclick="SeachBtn_Click" Text="搜索" />