private void Add_Score_Load(object sender, EventArgs e)
 {
     //Find current teacher begin
     foreach (var teachers in db.Teachers)
     {
         if (teachers.Name == tName && teachers.Surname == tSurname)
         {
             ActiveTeacher = teachers;
         }
     }
     //Find current teacher end
     //Find Groups of teacher begin
     foreach (var courses in db.Teacher_Group_Subject)
     {
         if (courses.Teacher_ID == ActiveTeacher.id)
         {
             if (GroupList.Contains(courses.Group.Name))
             {
             }
             else
             {
                 GroupList.Add(courses.Group.Name);
             }
         }
     }
     //Find Groups of teacher end
     //Add combobox groups
     cmbGroup.Items.Clear();
     foreach (var group in GroupList)
     {
         cmbGroup.Items.Add(group);
     }
     //Add combobox end
 }
 public Teacher(Model.Teacher current)
 {
     InitializeComponent();
     ActiveTeacher = current;
 }