CompareValidator问题,点reset 时为何也触发验证

一个修改密码页面,为什么呢
<%@ Page language="c#" Codebehind="checkequal.aspx.cs" AutoEventWireup="false" Inherits="random.checkequal" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>checkequal</title>
<meta content="Microsoft Visual Studio .NET 7.1" 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: 101; LEFT: 360px; POSITION: absolute; TOP: 128px"
runat="server" Width="152px"></asp:TextBox>
<asp:TextBox id="TextBox2" style="Z-INDEX: 102; LEFT: 360px; POSITION: absolute; TOP: 184px"
runat="server" Width="152px"></asp:TextBox>
<asp:Button id="Button1" style="Z-INDEX: 103; LEFT: 360px; POSITION: absolute; TOP: 264px" runat="server"
Width="80px" Text="Button"></asp:Button>
<asp:CompareValidator id="CompareValidator1" style="Z-INDEX: 104; LEFT: 344px; POSITION: absolute; TOP: 360px"
runat="server" Width="176px" ErrorMessage="密码必须相同" ControlToCompare="TextBox1" ControlToValidate="TextBox2"
Height="32px"></asp:CompareValidator><INPUT style="Z-INDEX: 105; LEFT: 496px; WIDTH: 80px; POSITION: absolute; TOP: 264px; HEIGHT: 24px"
type="reset" value="Reset"></FONT></form>
</body>
</HTML>