1. ASPX Page
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript" language="javascript" >
function callMe()
{
PageMethods.sayhello(document.getElementById('text1').value,oncomplete);
}
function oncomplete(val)
{
alert(val);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" >
</asp:ScriptManager>
<div>
<asp:TextBox ID="text1" runat="server"></asp:TextBox>
<input id="Button1" type="button" value="button" onclick="javascript:callMe();" /></div>
</form>
</body>
</html>
2. Code Behind
Imports System.Web.Services
Imports System.Web.Script.Services
Partial Public Class PageAjax
Inherits System.Web.UI.Page
<System.Web.Services.WebMethod()> _
<System.Web.Script.Services.ScriptMethod()> _
Public Shared Function sayhello(ByVal str As String) As String
Return "Hello " & str
End Function
End Class
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