private void releaceBtn_Click(object sender, EventArgs e)
{
roomsConn roomsConn = new roomsConn();
roomsConn.insertNotAvailableTimes(rName.Text.ToString(), rfaculty.Text.ToString(), rntime.Text.ToString());
notAvailableGridView.DataSource = roomsConn.load_not_available_details();
rrrname.DataSource = roomsConn.getNotAvailableRooms();
}