public String GetChartDataAsJson(String fileName, char fileSeparator = ';', bool hasFileLabels = true)
{
var chartService = new ChartService();
string userName = User.Identity.IsAuthenticated ? User.Identity.Name : "DefaultUser";
return(chartService.ChartDataToJson(chartService.GetChartDataFromFile(userName, fileName, fileSeparator), hasFileLabels));
}