private void rrbtn_Click(object sender, EventArgs e)
{
roomsConn roomsConn = new roomsConn();
String selectedRoomName = rrrname.Text.ToString();
roomsConn.DeleteNotAvailableRooms(selectedRoomName);
notAvailableGridView.DataSource = roomsConn.load_not_available_details();
rrrname.DataSource = roomsConn.getNotAvailableRooms();
}