public SurveyPage()
{
InitializeComponent();
List <Survey> survey = SurveyHelper.GetContext().Survey.ToList();
SurveyResult result = new SurveyResult()
{
MaleSum = survey.Where(n => n.Gender == "M").Count(),
FemaleSum = survey.Where(n => n.Gender == "F").Count()
};
GenderData.Items.Add(result);
}