Need to fill datatable on click of a button. (using control of datatables.net)

Question

I am using a custom control of datatables.net.

Hi i need to fill the datatable on click of a button.

this is the code that i have written on Load of the form

$('#dtlist').dataTable({
            "bPaginate": false,
            "bFilter": false,
            "bServerSide": true,
            "bSort": true,
            "sAjaxSource": 'AjaxProcess.aspx?opt=getJsondata',
            "fnServerData": function (sSource, aoData, fnCallback) {
                aoData.push({ "name": "country", "value": _Country }, { "name": "country", "value": _Country }, { "name": "city", "value": _City });
                $.ajax({
                    "dataType": 'json',
                    "type": "POST",
                    "url": sSource,
                    "data": aoData,
                    "success": fnCallback
                });
            }
        });

The above code fills the data with below option

Id   First Name   Last Name  Location  Country
1 Raj          Kumar        Andheri    India
2 Rajesh      Yadav        Juhu        India
Showing 1 to 2 of 12 entries

---

Now i hava button on the from where the data is shown. On click of the button i need to get data from the server and re-set it by clearing the existing data.

Below is the function that i have called on Button click

function FillTable() {
        var iCountry = 0;
        var iCityList = 0;
        if ($("#CountryList").html() != "")
            iCountry = $("#CountryList").val();

        if ($("#CityList").html() != "")
            iCityList = $("#CityList").val();

        var oTable;
        oTable = $('#dtlist').dataTable();

        oTable.push({ "name": "Country", "value": _Country }, { "name": "City", "value": iCityList });
        oTable.fnDraw(true);
    }

Please help it is urgent