private void EditButton_Click(object sender, EventArgs e)
        {
            if (StudentsListBox.CheckedItems.Count == 0)
            {
                return;
            }

            var selected = StudentsListBox.SelectedItem.ToString();

            var editSelectedStudent = new EditStudentForm(selected);

            editSelectedStudent.ShowDialog();
            RefreshStudentsListBox();
            StudentInfoListBox.Items.Clear();
        }