private void SelectUniversity_Click(object sender, RoutedEventArgs e)
        {
            SelectUniversity dialog = new UI.SelectUniversity();

            dialog.ShowDialog();
            if (dialog.DialogResult == true)
            {
                University.Text = dialog.UnivList.SelectedItem.ToString();
            }
        }
 private void ShowStat_Click(object sender, RoutedEventArgs e)
 {
     if (University.Text == "Choose university")
     {
         SelectUniversity dialog = new UI.SelectUniversity();
         dialog.ShowDialog();
         if (dialog.DialogResult == true)
         {
             University.Text = dialog.UnivList.SelectedItem.ToString();
         }
     }
     DataGridUniv.ItemsSource = Repository.GetDynamic(University.Text);
 }