ajax扩展控件(7)

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 >