asp.net - AJAX - "Success" action is not invoked when specifying contentType and dataType -


i run little bit of problem executing `ajax request.

when specifying contenttype , datatype, success section not executing. however, when omitting that, executing, showing entire content of generated html page.

here ajax call:

$.ajax({     type: "post",     url: "default.aspx/generatepdfs",     data: '{frequency: "' + $('#ddlfrequency option:selected').text() + '" }',     contenttype: "application/json; charset=utf-8",     datatype: "json",     success: function (data) {         $('#rptdisplay').text(data);         alert("1");     },     failure: function () {         //                $('#rptdisplay').text("error");         alert("2");     } });

this code behind:

[system.web.services.webmethod] public static void generatepdfs(string frequency) {     string test = frequency;     httpresponse response = httpcontext.current.response;     response.write(test); }

this fragment of html page:

<div id="rptdisplay" class="well" runat="server" clientidmode="static">  </div>

i need display data returned web method in div section.

what doing wrong?

hope you:

contenttype :when sending data server.

datatype: type of data you're expecting server. if none specified, jquery try infer based on mime type of response .

please find code:

    [system.web.services.webmethod]     public static string generatepdfs(string frequency)     {         string test = "frequency";//hard code value         httpresponse response = httpcontext.current.response;         return test;     }       design:       <asp:content runat="server" id="bodycontent"   contentplaceholderid="maincontent">       <div id="rptdisplay" class="well" runat="server" clientidmode="static">        </div>     <script src="scripts/jquery-1.7.1.min.js"></script>     <script src="scripts/jquery-ui-1.8.20.min.js"></script>     <script type="text/javascript">     $.ajax({         type: "post",         url: "default.aspx/generatepdfs",         data: '{frequency: "' + $('#ddlfrequency option:selected').text() + '" }',         contenttype: "application/json;charset=utf-8",        // datatype: "text/json",         success: function (data) {             debugger;             if (data.d!="") {                 $('#rptdisplay').text(data.d);             }             alert("1");         },         failure: function () {             //                $('#rptdisplay').text("error");             alert("2");         }     }); </script>


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