asp.net - AJAX Callback using POST method -

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i require assistance. using jquery cause ajax callback:

function testingcallback(controlid) {                  if (controlid == 'drpcontrol') {             var options =           {                 type: "post",                 url: "main.aspx",                 data: { drpcontrol: $(".drpcontrol").val() },                                //contenttype: "application/json; charset=utf-8",                 //cache: false,                 success: function (data) {                 },                 complete: function (jqxhr, status) {                     formdata = $("#form1").serialize();                     window.location = "main.aspx?" + formdata;                     showloadingbar();                     return false;                 }             };             var resp = $.ajax(options);         } }

and backend data so:

request.form["drpcontrol"], works well.

but add line callback options : contenttype: "application/json; charset=utf-8",, value of null request.form["drpcontrol"].

please assist on how overcome this.

thanks in advance

might add trying cause postback keep control values, hence line :

    formdata = $("#form1").serialize();     window.location = "main.aspx?" + formdata;

but after second postback (on change of drpcontrol) field values gets cleared, assuming has ie not being able cater long querystring, have tested in chrome , works perfect, not ie, , need work ie 8.any suggestions?

in content type add 

contenttype: "application/json"

designating encoding redundant json, since default encoding json utf-8. in case receiving server apparently happy knowing it's dealing json , assumes encoding utf-8 default, that's why works or without header.

contenttype (default: 'application/x-www-form-urlencoded; charset=utf-8')- when sending data server, use content type. default "application/x-www-form-urlencoded; charset=utf-8", fine cases. if explicitly pass in content-type $.ajax(), it'll sent server (even if no data sent). if no charset specified, data transmitted server using server's default charset; must decode appropriately on server side.

note sure pass data 

data: "{'drpcontrol' : " + $(".drpcontrol").val()+ "}",

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