public static MesaDAL Getinstancia()
 {
     if (instance == null)
     {
         instance = new MesaDAL();
     }
     return(instance);
 }
        public void AlterMesa(MesaDAL objaux)
        {
            try
            {
                using (OracleConnection con = new Conexion().conexion())
                {
                    OracleDataAdapter da = new OracleDataAdapter();
                    OracleCommand     cm = new OracleCommand("Altermesa", con);
                    cm.BindByName  = true;
                    cm.CommandType = System.Data.CommandType.StoredProcedure;
                    cm.Parameters.Add("sala", OracleDbType.Varchar2).Value = Nombre_sala;
                    cm.Parameters.Add("cap", OracleDbType.Int32).Value     = Capacidad;
                    cm.Parameters.Add("id_", OracleDbType.Int32).Value     = Id_mesa;

                    con.Open();
                    cm.ExecuteNonQuery();
                    con.Close();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("" + ex);
            }
        }