private void InitializeBindMachine()
        {
            if (this.DropDownListCurrentRooms.SelectedValue != null)
            {
                MachineBusiness business = new MachineBusiness();

                string roomId = this.DropDownListCurrentRooms.SelectedValue;
                List<Machine> machines = business.QueryByRoom(roomId);
                Machine emptyMachine = new Machine();
                machines.Insert(0, emptyMachine);

                this.DropDownListMachines.DataSource = machines;
                this.DropDownListMachines.DataTextField = "Name";
                this.DropDownListMachines.DataValueField = "Guid";
                this.DropDownListMachines.DataBind();
            }
        }
        private void InitializeBindMachine()
        {
            if (this.DropDownListRooms.SelectedValue != null)
            {
                MachineBusiness business = new MachineBusiness();

                string roomId = this.DropDownListRooms.SelectedValue;
                List<Machine> machines = business.QueryByRoom(roomId);
                Machine emptyMachine = new Machine();
                machines.Insert(0, emptyMachine);

                this.DropDownListMachines.DataSource = machines;
                this.DropDownListMachines.DataTextField = "Name";
                this.DropDownListMachines.DataValueField = "Guid";
                this.DropDownListMachines.DataBind();

                if (!string.IsNullOrEmpty(this.MachineId))
                {
                    for (int i = 0; i < machines.Count; i++)
                    {
                        if (string.Equals(this.MachineId, machines[i].Guid, StringComparison.CurrentCultureIgnoreCase))
                        {
                            this.DropDownListMachines.SelectedValue = this.MachineId;
                            break;
                        }
                    }
                }
            }
        }