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    copied!<p>To send a value from javascript to the server you have a couple of options:</p> <ol> <li>Use AJAX if you want to stay on the current page</li> <li>Redirect to a server side script and pass the value in the querystring</li> </ol> <p>Let's consider the first case:</p> <p>Assuming you have a web method capable of receiving the value on the server:</p> <pre><code>&lt;%@ Page Title="Home Page" Language="C#" AutoEventWireup="true" %&gt; &lt;script type="text/C#" runat="server"&gt; // Server side script in the code behind that will receive // the value: The method needs to be static // and decorated with the WebMethod attribute [System.Web.Services.WebMethod] public static string Foo(string id) { return "ok"; } &lt;/script&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"&gt; &lt;head id="Head1" runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;link href="~/Styles/Site.css" rel="stylesheet" type="text/css" /&gt; &lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(function () { // Send an AJAX request to the server $.ajax({ url: '/default.aspx/foo', type: 'POST', contentType: 'application/json; charset=utf-8', // Pass the value as JSON string // You might need to include json2.js for the JSON.stringify // method: http://www.json.org/json2.js data: JSON.stringify({ id: 'someId123' }), success: function (result) { // The result is also JSON alert(result.d); } }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="Form1" runat="server"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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