Ajax Page Response

        var temp = document.getElementById("dvDiv").innerHTML;
        document.getElementById("dvDiv").innerHTML = "<span style='verticle-align:middle;color:#FF5500;font-family:verdana;word-spacing:4px'><img src='../images/loading.gif' /><strong>wait...</strong></span>";
        
  //Show loading message with image
       
       
        var xmlhttp = GetXMLRequestObject();
        var Rurl = "Page.aspx?qs=your query string here" ;
        xmlhttp.open('POST', Rurl, true);
        xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xmlhttp.send(SomeId);
        xmlhttp.onreadystatechange = function () {
            if (xmlhttp.readyState == 4) {
                var responseText = xmlhttp.responseText;
                document.getElementById("dvDiv").innerHTML = responseText; //Show the response here
      }
      }
 
                xmlhttp = null;
            }

How to render user control in asp.net with ajax

function yourfunction(val1) {
$.ajax({
type: "POST",
url: "..GetData.aspx",
data: 'param=ctlParam&qs=' + val1,
success: function (data) {
//do what you need
},
error: function (request, status, error) {
alert(request.responseText);
}
});
}


Use the code in .aspx page

Dim strparam As String = Request.Form("param")
Dim strResponse As String = ""
hshProperty.Add("qs", Convert.ToInt32(Request.Form("qs")))
strResponse = ViewManager.RenderUserControl("yourcontrol.ascx", hshProperty)

''qs will be property in yourcontrol.ascx

Response.Write(strResponse)