ASP.NET Tutorial/Ajax/FilteredTextBox

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Using the FilteredTextBox Control

<%@ Page Language="C#" %>
<%@ Register TagPrefix="ajax" Namespace="AjaxControlToolkit"
 Assembly="AjaxControlToolkit" %>
<!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>Show Filtered TextBox</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:Label
            id="lblNumeric"
            Text="Enter a Number:"
            AssociatedControlID="txtNumeric"
            Runat="server" />
        <br />
        <asp:TextBox
            id="txtNumeric"
            Runat="server" />
        <ajax:FilteredTextBoxExtender
            id="fte1"
            TargetControlID="txtNumeric"
            FilterType="Numbers"
            Runat="server" />
        <br /><br />
        <asp:Label
            id="lblProductCode"
            Text="Enter a Product Code:"
            AssociatedControlID="txtProductCode"
            Runat="server" />
        <br />
        <asp:TextBox
            id="txtProductCode"
            Runat="server" />
        <ajax:FilteredTextBoxExtender
            id="fte2"
            TargetControlID="txtProductCode"
            FilterType="LowercaseLetters,Custom"
            FilterMode="ValidChars"
            ValidChars="_!"
            Runat="server" />
        <br />
        (A product code can contain only lower-case characters,
        underscores, exclamation marks, and no spaces)
    </div>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Ajax/FilteredTextBox&oldid=3029»