private void changingHeadteacherReadyButtonClick(object sender, EventArgs e)
{
if (teachersDropdownlist.SelectedItem != null)
{
changeHeadTeacherButton.Visible = true;
changingHeadteacherReadyButton.Visible = false;
teachersDropdownlist.Visible = false;
headTeacherNameLabel.Text = teachersDropdownlist.Text;
}
else
{
RadMessageBox.Show("Трябва да изберете учител от списъка!", "Грешка!");
}
}