//
function dropTree() {

$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "IgTree.aspx/GetTree",

data: {},
success: function (data) {
if (data.d != null && data.d[0] != null) {
if (data.d[0] != null) {
PopulateGridWoSorting("Tree", data.d);
debugger;
};

};
}, error: function (data) {
alert("failed posted data");
}

});

function PopulateGridWoSorting(iid, data) {
debugger;
$('#' + iid).igTreeGrid({
dataSource: data[1], primaryKey: "id",
foreignKey: "ParentId",
//responseDataKey: "results",
dataSourceType: "json",
autoGenerateColumns: false,

 columns: data[0],

});

};

};

// ]]>

i am getting data from database through datatable 

i works when i simply bind grid but

when i uncomment primary and foreign key data get hide except header  and no error occur ....