How to call Codebehind method from Javascript (C# ASP.NET)

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CodeBehindMethodFromJavascript.aspx.cs"Inherits="CodeBehindMethodFromJavascript" %><!
<
<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></title><script type="text/javascript">

alert(
}

</
<function test() {var VarA = document.getElementById("txtAB").value;'<%=new CodeBehindMethodFromJavascript().GetName("' + VarA + '")%>');</script>head>body><form id="form1" runat="server"><div><input type="text" id="txtAB" /><input type="button" value="ClickMe" onclick="test()" /></div>
</
</</form>body>html>