案例：ASP.NET案例     状态：不可编辑再运行    进入竖版
 运行结果　
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<script  runat="server">
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sub submit(sender As Object, e As EventArgs)
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if Page.IsValid then
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   lbl.Text="页面有效！"
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else
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   lbl.Text="页面无效！"
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end if
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end sub
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</script>
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​
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<html>
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<body>
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​
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<form runat="server">
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请输入 US 邮政编码：
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<asp:TextBox id="txtbox1" runat="server" />
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<br /><br />
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<asp:Button text="提交" OnClick="submit" runat="server" />
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<br /><br />
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<asp:Label id="lbl" runat="server" />
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<br />
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<asp:RegularExpressionValidator
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ControlToValidate="txtbox1"
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ValidationExpression="\d{5}"
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EnableClientScript="false"
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ErrorMessage="邮编必须是五位数字！"
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runat="server" />
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</form>
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​
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</body>
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</html>
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​