代码演示（仅展示主要判断语句部分）
<html>
<head id="Head1" runat="server">
<title>登录判断测试</title>
</head>
<body id="Body1" runat="server">
<!--表单-->
<form id="Form1" runat="server">
<!--表格-->
<table id="Table1" runat="server" width="480px">
<tr>
<td style="width: 85px">
姓名：
</td>
<td>
<asp:TextBox runat="Server" ID="TBName" Text="" />
<!--判断是否输入信息-->
<asp:RequiredFieldValidator ID="RFVName" runat="Server" ControlToValidate="TBName" ErrorMessage="请输入用户名" InitialValue="" />
</td>
</tr>
<tr>
<td style="width: 85px">
密码：
</td>
<td>
<asp:TextBox runat="Server" ID="TBPassword1" />
</td>
</tr>
<tr>
<td style="width: 85px">
确认密码：
</td>
<td>
<asp:TextBox runat="Server" ID="TBPassword2" />
<!--判断两次密码是否一致-->
<asp:CompareValidator ID="CVPassword" runat="Server" ControlToValidate="TBPassword1" ControlToCompare="TBPassword2" Type="String" ErrorMessage="两次输入的密码不一致" Operator="Equal" />
</td>
</tr>
<tr>
<td style="width: 85px">
年龄：
</td>
<td>
<asp:TextBox runat="Server" ID="TBAge" />
<!--设定年龄范围-->
<asp:RangeValidator ID="RVAge" runat="Server" ControlToValidate="TBAge" MaximumValue="150" MinimumValue="1" Type="Integer" ErrorMessage="年龄必须在1~150之间" />
</td>
</tr>
<tr>
<td colspan="2" align="center">
<asp:Button ID="BtnSubmit" runat="Server" Text="确定" OnClick="myCheck" />
</td>
</tr>
</table>
<p>
<asp:Label runat="Server" ID="LBStatus" Text="" />
<!--汇总显示其他控件效果-->
<asp:ValidationSummary ID="ValidationSummary1" runat="Server" DisplayMode="BulletList"
ShowMessageBox="True" HeaderText="出错信息" />
<br />
</p>
</form>
</body>
</html>
运行结果
