FilteredTextBox

<%@ Page
    Language="C#"
    MasterPageFile="~/Default.master"
    AutoEventWireup="true"
    CodeFile="FilteredTextBox.aspx.cs"
    Inherits="FilteredTextBox"
    Title="FilteredTextBox Tests" %>



<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" runat="server"  
    TargetControlID="TextBox1"
    ValidChars="0" />
    
    <ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender2" runat="server"   
    TargetControlID="TextBox2"
    FilterType="Numbers"/>
    
  <ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender3" runat="server"   
    TargetControlID="TextBox3"
    FilterType="UppercaseLetters" />
    
    <ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender4" runat="server"  
    TargetControlID="TextBox4"
    FilterType="LowercaseLetters"/>
    
    <ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender5" runat="server"
    TargetControlID="TextBox5"
    ValidChars="$"
    FilterType="Custom,Numbers" />
    
    <ajaxToolkit:FilteredTextBoxExtender ID="FilteredTextBoxExtender6" runat="server"
    TargetControlID="TextBox6"
    InvalidChars="1234567890"
    FilterType="Custom"
    FilterMode="InvalidChars" />
    
Only zeroes are allowed: <asp:TextBox ID="TextBox1" runat="server" /><br />
Only numbers are allowed: <asp:TextBox ID="TextBox2" runat="server" /><br />
Only upper case letters are allowed: <asp:TextBox ID="TextBox3" runat="server" /><br />
Only lower case letters are allowed: <asp:TextBox ID="TextBox4" runat="server" /><br />
Only Number and custom: <asp:TextBox ID="TextBox5" runat="server" /><br />
Everything but numbers: <asp:TextBox ID="TextBox6" runat="server" /><br />

   

</asp:Content>