private void ComboBoxAndTextBoxChanged()
 {
     HandlePrev(false);
     HandleNext(false);
     Students.SearchForStudent(searchComboBox.Text, searchTextBox.Text);
     if (Students.FoundList.Count > 0)
     {
         Students.ChangeToFoundList();
         SelectFirstInList();
     }
     else
     {
         HandleTextBoxes(false);
     }
 }