A Forgotten Story - Ajax in ASP.NET using JavaScript

http://blogs.cametoofar.com/post/raw-or-plain-ajax-in-aspnet-using-javascript.aspx

<script type="text/javascript">

    function sendViaAjax() {

        // Build URL to make Ajax call

        var url = "Test.aspx?name=" + document.getElementById("txtName").value;

        // Creates an Ajax call object

        var xmlHttp; = new XMLHttpRequest();

        // Specify URL to connect

        xmlHttp.open("GET", url, true);

        // Callback function to handle response from Server

        xmlHttp.onreadystatechange = function () {

            if (xmlHttp.readyState == 4) {

                if (xmlHttp.status == 200) {

                    alert(xmlHttp.responseText);

                }

            }

        };

        // Send Ajax request to Server

        xmlHttp.send();

    }

</script>

protected void Page_Load(object sender, EventArgs e)
{
    string ajxValue = "Hello " + Request.QueryString["name"] + " !";
 
    Response.Write(ajxValue);   // Write the Response
    Response.End(); // End Response
}