<%@ Page Language="C#" %>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
string callback = this.ClientScript.GetCallbackEventReference(this, "this.value", "ProcessReverse", null);
this.TextBox1.Attributes.Add("onchange", callback);
}
string ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
{
char [] chars = eventArgument.ToCharArray();
Array.Reverse(chars);
return new string(chars);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>
<script>
function ProcessReverse(result,context)
{
alert(result)
document.all.TextBox1.value = result;
}
</script>
