FilteredTextBox控件，该控件用于控制用户的输入值的范围。
实例代码如下所示：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FilteredTextBoxDemo.aspx.cs"
Inherits="FilteredTextBoxDemo" %>
<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<table border="0">
<tr>
<td>只允许输入数字</td>
<td><asp:TextBox ID="TextBox1" runat="server" /> </td>
</tr>
<tr>
<td>只允许输入小写字母:</td>
<td><asp:TextBox ID="TextBox2" runat="server" /></td>
</tr>
<tr>
<td>只允许输入 (+,-,*,/,=,.) 和数字:</td>
<td> <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></td>
</tr>
</table>
<cc1:FilteredTextBoxExtender
ID="FilteredTextBoxExtender1"
runat="server"
TargetControlID="TextBox1"
FilterType="Numbers" />
<cc1:FilteredTextBoxExtender
ID="FilteredTextBoxExtender2"
runat="server"
TargetControlID="TextBox2"
FilterType="LowercaseLetters" />
<cc1:FilteredTextBoxExtender
ID="FilteredTextBoxExtender3"
runat="server"
TargetControlID="TextBox3"
FilterType="Custom, Numbers"
ValidChars="+-=/*()." />
</div>
</form>
</body>
</html>
实例代码如下所示：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FilteredTextBoxDemo.aspx.cs" 
Inherits="FilteredTextBoxDemo" %>
<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %><%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>无标题页</title></head><body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <table border="0"> <tr> <td>只允许输入数字</td> <td><asp:TextBox ID="TextBox1" runat="server" /> </td> </tr> <tr> <td>只允许输入小写字母:</td> <td><asp:TextBox ID="TextBox2" runat="server" /></td> </tr> <tr> <td>只允许输入 (+,-,*,/,=,.) 和数字:</td> <td> <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></td> </tr> </table> <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" runat="server" TargetControlID="TextBox1" FilterType="Numbers" /> <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender2" runat="server" TargetControlID="TextBox2" FilterType="LowercaseLetters" /> <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender3" runat="server" TargetControlID="TextBox3" FilterType="Custom, Numbers" ValidChars="+-=/*()." /> </div> </form></body></html>
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