// изменить статус зала
private void CSbtn_Click(object sender, EventArgs e)
{
Form frm = new ChangePrice();
frm.Show();
Course customer = new Course();
List <string> list = new List <string>();
list = customer.getCoursePrice();
CorseList.DataSource = list;
}
private void CPbtn_Click(object sender, EventArgs e)
{
Form frm = new ChangePrice();
frm.Show();
}