public static DBGroups GetInstance()
{
if (dBGroups == null)
{
dBGroups = new DBGroups();
}
return(dBGroups);
}
private void LoadGroups()
{
IEnumerable <Group> groups = DBGroups.GetInstance().GetAllGroups();
foreach (Group group in groups)
{
comboGroupBox.Items.Add(group);
}
}