📄 webform1.aspx
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<%@ Page validateRequest="false" language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="Chapter_06.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<!-- < and > represent < and > -->
<asp:Label id="Label1" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 16px" runat="server">Enter text to display (<b>, <i>, <hr> acceptable):</asp:Label>
<asp:Button id="Button1" style="Z-INDEX: 103; LEFT: 8px; POSITION: absolute; TOP: 168px" runat="server"
Text="Display"></asp:Button>
<asp:TextBox id="TextBox1" style="Z-INDEX: 102; LEFT: 8px; POSITION: absolute; TOP: 40px" runat="server"
TextMode="MultiLine" Height="112px" Width="432px"></asp:TextBox>
<!-- This validation expression will allow only <i>, <b>, and <hr> tags,
spaces, any text A-Za-z0-9, and the following punctuation: ?!,.'".
All other input will cause the validation to fail.
Note that this expression does not validate for well-formed HTML -->
<asp:RegularExpressionValidator id="RegularExpressionValidator1" style="Z-INDEX: 104; LEFT: 16px; POSITION: absolute; TOP: 200px"
runat="server" ErrorMessage="Invalid Input Found!" ValidationExpression="^([\s\w\?\!\,\.\'\"]*|(</?(i|I|b|B|hr|HR)>))*$"
ControlToValidate="TextBox1"></asp:RegularExpressionValidator>
<asp:Label id="Label2" style="Z-INDEX: 105; LEFT: 16px; POSITION: absolute; TOP: 232px" runat="server"></asp:Label>
</form>
</body>
</HTML>
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