===超级奇怪的问题==========

是不是你WebForm1.aspx.cs的问题啊？
这样没有问题
<%@ Page language="c#" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta content="Microsoft Visual Studio 7.0" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<asp:textbox id="TextBox1" style="Z-INDEX: 102; LEFT: 141px; POSITION: absolute; TOP: 11px" runat="server"></asp:textbox>
<br>
<asp:HyperLink id="HyperLink1" runat="server">HyperLink</asp:HyperLink>
<br>
<asp:Button id="Button1" runat="server" Text="Button" Width="89px" Height="25px"></asp:Button>
<br>
<asp:Label id="Label1"  runat="server" Width="69px" Height="10px">Label</asp:Label></FONT></form>
</body>
</HTML>