private void GetData()
{
StudentBll studentBll = new StudentBll();
list = studentBll.GetAnnouncements();
AnnouncementComboBox.DataContext = list;
for (int i = 0; i < list.Count; i++)
{
ComboBoxItem item = new ComboBoxItem();
item.Content = list[i].Title;
AnnouncementComboBox.Items.Add(item);
}
}