public void dropdown1()
        {
            ab1.Clear();
            SqlCommand    a  = new SqlCommand("select * from S_Allocation", Connection.get());
            SqlDataReader aa = a.ExecuteReader();

            while (aa.Read())
            {
                S_Allocation ao = new S_Allocation()
                {
                    Allocation_ID = (int)aa[0]
                };
                ab1.Add(ao);
            }
            aa.Close();
        }
        public S_Allocation UpItem(int Allocation_ID)
        {
            string        q   = "Select * from S_Allocation Where Allocation_ID =" + Allocation_ID;
            SqlCommand    sc  = new SqlCommand(q, Connection.get());
            SqlDataReader sdr = sc.ExecuteReader();
            S_Allocation  u   = new S_Allocation();

            while (sdr.Read())
            {
                u.Allocation_ID = (int)sdr["Allocation_ID"];
                u.S_ID          = (int)sdr["S_ID"];
                u.Room_ID       = (int)sdr["Room_ID"];
                u.Start_Date    = (string)sdr["Start_Date"];
                u.End_Date      = (string)sdr["End_Date"];
            }
            sdr.Close();
            return(u);
        }
        public List <S_Allocation> ShowAll()
        {
            string              q   = "Select * from S_Allocation";
            SqlCommand          sc  = new SqlCommand(q, Connection.get());
            SqlDataReader       sdr = sc.ExecuteReader();
            List <S_Allocation> lst = new List <S_Allocation>();

            while (sdr.Read())
            {
                S_Allocation u = new S_Allocation();
                u.Allocation_ID = (int)sdr["Allocation_ID"];
                u.S_ID          = (int)sdr["S_ID"];
                u.Room_ID       = (int)sdr["Room_ID"];
                u.Start_Date    = (string)sdr["Start_Date"];
                u.End_Date      = (string)sdr["End_Date"];
                lst.Add(u);
            }
            sdr.Close();
            return(lst);
        }