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rangevalidator控件主要界定输入的值的范围。因为有时我们要求输入的值是要有一定范围的，所以我们要使用rangevalidator来判断。
在下面的这个例子中，我们将来介绍rangevalidator控件。
请看validata5.aspx的程序内容：
<!–源文件：form\web页面简介\validate5.aspx–>
<%@ page clienttarget=downlevel %>
<html>
<center>
<title>rangevalidator控件演示</title>
<head>
<script language="vb" runat="server">
sub button1_click(sender as object, e as eventargs)
if (page.isvalid) then
lbloutput.text = "结果正确!"
else
lbloutput.text = "结果不正确!"
end if
end sub
sub lstoperator_selectedindexchanged(sender as object, e as eventargs)
rangeval.type = lsttype.selectedindex
rangeval.validate
end sub
</script>
</head>
<body>
<h3><font face="verdana">rangevalidator控件演示</font></h3>
<p>
<form runat="server">
<table bgcolor="#eeeeee" cellpadding=10>
<tr valign="top">
<td>
<h5><font face="verdana">输入要验证的值:</font></h5>
<asp:textbox selected id="txtcomp" runat="server"/>
</td>
<td>
<h5><font face="verdana">数据类型:</font></h5>
<asp:dropdownlist id="lsttype" onselectedindexchanged="lstoperator_selectedindexchanged" runat=server>
<asp:listitem selected value="string" >string</asp:listitem>
<asp:listitem value="integer" >integer</asp:listitem>
</asp:dropdownlist>
</td>
<td>
<h5><font face="verdana">最小值:</font></h5>
<asp:textbox id="txtmin" runat="server" />
</td>
<td>
<h5><font face="verdana">最大值:</font></h5>
<asp:textbox id="txtmax" runat="server" /><p>
<asp:button text="验证" id="button1" onclick="button1_click" runat="server" />
</td>
</tr>
</table>
<asp:rangevalidator id="rangeval" type="string" controltovalidate="txtcomp" maximumcontrol="txtmax" minimumcontrol="txtmin" runat="server"/>
<br>
<asp:label id="lbloutput" font-name="verdana" font-size="10pt" runat="server" />
</form>
</body>
</center>
</html>
当我们在三个文本框中分别输入要验证的值，最大值，和最小值，然后按下验证按钮，页面上将显示判断的结果。
