<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:///TR/xhtml1/DTD/">
<script runat="server"><!--
protected void Page_Load(object sender, EventArgs e)
{
if(!)
{
("onkeyup", "LimitText()");
}
}
// --></script>
<html xmlns="http:///1999/xhtml" >
<head runat="server">
<title>Unt title page</title>
<script type="text/javascript"><!--
function LimitText()
{
//Get the number of characters in the text box at this time
var Len=('TextBox1').;
//Get the default value of the text box 5
var TxtSize=('TextBox1');
if(>20)
{
=20;
=(0,20);
('ban').innerText="No more than 20 characters!";
}
else
{
=Len+1;
}
}
// --></script>
</head>
<body>
<form runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server" size="5"></asp:TextBox>
<span ></span>
</div>
</form>
</body>
</html>