asp.net高级教程（五）---实战篇（结合论坛用户操作谈asp.net表单验证)（中)
做好准备工作，现在就要动真格的了，先让我们看看用户注册的实现。前边已经讲过，asp.net可以实现业务逻辑和html代码分离，那么让我们来看看到底是如何实现的，下面这个文件是用户注册的页面部分，原型是根据我站点的风格制作的：
<%@Page language="c#" Codebehind="Register.cs" AutoEventWireup="false" Inherits="bbs.Register" %>
<%@Register Tagprefix="My" Namespace="bbs.uctrl"%>
<html><head>
<TITLE>新用户注册</TITLE>
<meta name=vs_targetSchema content="HTML 4.0">
<link rel="stylesheet" href="images/style.css">
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#"></head>
<script language=javascript>
function OnPreview()
{
divPreview.innerHTML = Form1.txtSignature.value ;
}
</script>
<body>
<form method="post" runat="server" ID=Form1>
<My:MyHead id="myHead1" runat="server"></MY:MYHEAD>
<!----------------------外面表格形成边框-------------------------------------->
<table width='722' border='0' cellspacing=0
cellpadding='0' align='center'>
<TBODY>
<tr>
<!-------------------左边竖线---------------------------------------------->
<td bgcolor='#0097c0' width='1'>
<img src='images/Shim.gif' width=1>
</td>
<td width=720 align=middle><br><br><br>
<!-------------------左边竖线---------------------------------------------->
<!--------------新用户注册开始---------------------------------------------->
<table width=600 align=center border=0 cellpadding=4 cellspacing=1
id="tblRegister" class=cn bgcolor=#000000 runat=server>
<TBODY>
<tr bgcolor=#ffffff>
<td colspan=3>
<p align=center>新用户注册</p>
</td>
</tr>
<!--------------用户名开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
用户名
</td>
<td width=300>
<asp:TextBox id="txtUserName" maxlength=20 columns=20 runat="server"></asp:TextBox>
<font color=red>*</font>
</td>
<td width=240>
用户笔名，4-20字符
<asp:requiredfieldvalidator id="reqUserName" display=Dynamic
controltovalidate="txtUserName" runat=Server>
不能为空！
</asp:requiredfieldvalidator>
<asp:regularexpressionvalidator id="regUserName" display=Dynamic
controltovalidate="txtUserName" runat=Server validationexpression="[^']{4,20}">
用户名非法！
</asp:regularexpressionvalidator>
<asp:customvalidator id="cusUserName" controltovalidate="txtUserName"
onservervalidate="ValidUser" display=Dynamic runat=Server>
该用户已存在。
</asp:customvalidator>
</td>
</tr>
<!--------------用户名结束-------------------------------------------------------->
<!--------------用户密码开始-------------------------------------------------------->
<tr bgcolor=#ffffff>
<td width=60>
密码
</td>
<td width=300>
<asp:TextBox id="txtPassword" maxlength=10 columns=10
textmode=Password runat=server></asp:TextBox>
<font color=red>*</font>
</td>
<td width=240>
用户密码，4-10字符
<asp:requiredfieldvalidator id=Requiredfieldvalidator1 display=Dynamic
controltovalidate="txtPassword" runat=Server>
不能为空！
</asp:requiredfieldvalidator>
<asp:regularexpressionvalidator id=Regularexpressionvalidator1 display=Dynamic
controltovalidate="txtPassword" runat=Server validationexpression="[^']{4,10}">
密码非法！
</asp:regularexpressionvalidator>
</td>
</tr>
<!--------------用户密码结束-------------------------------------------------------->
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