<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
</div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
用户名: <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged"> </asp:TextBox> <!--OnTextChanged判断用户是否存在--> <asp:Label ID="Label1" runat="server"> </asp:Label>
<br />
密 码: <asp:TextBox ID="TextBox2" runat="server"> </asp:TextBox> <br />
<asp:Button ID="Button1" runat="server" Text="Add用户" OnClick="Button1_Click" />
&nbs
