为何CompareValidator控件没有起作用

[book_Haoye]

代码如下:
<tr style="COLOR: #003399; BACKGROUND-COLOR: #ffffff">
<td align="right" width="120">用户密码：</td>
<td><asp:textbox id="txtPassword" Runat="server" MaxLength="255" Width="250" TextMode="Password" CssClass="myText"></asp:textbox><FONT face="宋体" color="#ff0066">*
<asp:requiredfieldvalidator id="rfvPassword" runat="server" ErrorMessage="此项不能为空！" ControlToValidate="txtPassword"></asp:requiredfieldvalidator></FONT></td></tr>
<tr style="COLOR: #003399; BACKGROUND-COLOR: #ffffff">
<td align="right" width="120">确认密码：</td>
<td><asp:textbox id="txtConfirmPassword" Runat="server" MaxLength="255" TextMode="Password" Width="250" CssClass="myText"></asp:textbox><FONT face="宋体" color="#ff0066">*
<asp:CompareValidator id="cvConfirmPassword" runat="server" ErrorMessage="两次输入的密码不一致！" ControlToValidate="txtConfirmPassword" ControlToCompare="txtPassword" Type="String" Operator="Equal" /></FONT></td></tr>

要求是输入的两次密码必须一致,但是输入"用户密码",而不输入"确认密码"时,CompareValidator没有起作用,是我的用法不正确吗??

[book_Haoye]

谢谢各位!!!

[copine]

两个字段controltovalidate controltocompare你可以这样理解你要验证的值实际上是controltovalidate的value,或者这个value=comtroltocompare.value或者这个value为空那么验证结果都为validate否则就是invalidate，所以你看到的行为正是这个控件的的特性，其实regularexpressionvalidator的行为也类似啊，空值的时候不做验证，如果你不希望他为空的话，可以再加一个requiredfiledvalidator.

[shalen520]

再加一个requiredfiledvalidator

[houlinghouling]

改为
<table>
<tr style="COLOR: #003399; BACKGROUND-COLOR: #ffffff">
<td align="right" width="120">用户密码：</td>
<td><asp:textbox id="txtPassword" Runat="server" MaxLength="255" Width="250" TextMode="Password"
CssClass="myText"></asp:textbox><FONT face="宋体" color="#ff0066">*
<asp:requiredfieldvalidator id="rfvPassword" runat="server" ErrorMessage="此项不能为空！" ControlToValidate="txtPassword"></asp:requiredfieldvalidator></FONT></td>
</tr>
<tr style="COLOR: #003399; BACKGROUND-COLOR: #ffffff">
<td align="right" width="120">确认密码：</td>
<td><asp:textbox id="txtConfirmPassword" Runat="server" MaxLength="255" TextMode="Password" Width="250"
CssClass="myText"></asp:textbox><FONT face="宋体" color="#ff0066">*
<asp:CompareValidator id="cvConfirmPassword" runat="server" ErrorMessage="两次输入的密码不一致！" ControlToValidate="txtConfirmPassword"
ControlToCompare="txtPassword" Type="String" Operator="Equal" /></FONT></td>
</tr>
<tr>
<td>
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button></td>
<td>
<asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="txtConfirmPassword"
ErrorMessage="两次输入的密码不一致！"></asp:RequiredFieldValidator></td>
</tr>
</table>