📄 callback.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Callback.aspx.cs" Inherits="ClientCallback" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<script type="text/javascript">
function LookUpStock()
{
var lb = document.forms[0].ListBox1;
var product = lb.options[lb.selectedIndex].text
CallServer(product, "");
}
function ReceiveServerData(rValue)
{
Results.innerText = rValue;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="ListBox1" Runat="server"></asp:ListBox>
<br />
<br />
<button onclick="LookUpStock()">Look Up Stock</button>
<br />
<br />
Items in stock: <span ID="Results"></span>
<br />
</div>
</form>
</body>
</html>
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