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jquery serialize and .net controls
<asp:DropDownList ID="ddFirmaAd" runat="server" Width="180" Height="25">
        </asp:DropDownList>

ajaxRequest("AjaxServices/Insert.aspx", $("#aspnetForm").serialize(), $('#returnMessage'), 0, $(this));

 function ajaxRequest(pageURL, queryString, putArea, timeout, disabledCtrl) {
        if (disabledCtrl != null)
            disabledCtrl.attr("disabled", "true");
        $.ajax({
            async: true,
            timeout: timeout,
            cache: false,
            url: pageURL + "?" + queryString,


alert($("#aspnetForm").find("input,textarea,select,hidden").not("#__VIEWSTATE,#__EVENTVALIDATION").serialize());

string value = request.queryString("ddFirmaAd");

private string GetValueById(string endsWith)
    {
        var qs = HttpContext.Current.Request.QueryString;
        foreach(var key in qs)
        {
            string skey = key.ToString();
            if(skey.EndsWith(endsWith))
            {
                return qs[skey];
            }

        }
        return string.Empty;
    }