string 转 json数据

前台：$(function () {
$.get("index.ashx", { action: "title" }, function (data) {
var result = eval(‘(‘ + data + ‘)‘);

$("h1").html(result.name);
$("h5").html(result.cell);
})
})

后台：

string user_id_con = "select use_name,use_cell from dt_User where [email protected]";
DataTable dt = DBHelper.GetTable(user_id_con, parameters: new SqlParameter("@id", xx));
return "{\"name\":\"" + dt.Rows[0]["use_name"] + "\",\"cell\":\"" + dt.Rows[0]["use_cell"] + "\"}";