<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Ex4-5.aspx.cs" Inherits="Ex4_5" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Ex4-5</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        用户名：<asp:TextBox ID="txtname" runat="server"></asp:TextBox>
        <asp:Button ID="btnseek" runat="server" onclick="btnseek_Click" Text="用户名是否被注册" />
    </div>
    </form>
</body>
</html>
