Problem while Reloading Data through fnReloadAjax() and also fnClearTable() does not works....

lakhanimoez

i am new to DataTables.I have loaded the DataTable with JSON But when I pass querystring in fnReloadAjax() method DataTable remains unaffected.No changes takes place in datatable.I can see the json string returned from the server in the debugger(in XHR Response).
I Have checked my json string its correct one also oTable.fnClearTable() does not works on button click.Please Help
below is my code :
[code] $.fn.dataTableExt.oApi.fnReloadAjax = function ( oSettings, sNewSource, fnCallback, bStandingRedraw )
{
if ( typeof sNewSource != 'undefined' && sNewSource != null )
{
oSettings.sAjaxSource = sNewSource;
}
this.oApi._fnProcessingDisplay( oSettings, true );
var that = this;
var iStart = oSettings._iDisplayStart;
var aData = [];

this.oApi._fnServerParams( oSettings, aData );

oSettings.fnServerData( oSettings.sAjaxSource, aData, function(json) {
/* Clear the old information from the table */
that.oApi._fnClearTable( oSettings );

/* Got the data - add it to the table */
var aData = (oSettings.sAjaxDataProp !== "") ?
that.oApi._fnGetObjectDataFn( oSettings.sAjaxDataProp )( json ) : json;

for ( var i=0 ; i