private void GroupMachineForm_Load(object sender, EventArgs e)
        {
            ValueObjectList <GroupMachineVo> machinevo = (ValueObjectList <GroupMachineVo>)DefaultCbmInvoker.Invoke(new GetGroupMachineNameCbm(), new GroupMachineVo());

            GroupMachine_cmb.DisplayMember = "GroupMachineName";
            BindingSource b4 = new BindingSource(machinevo.GetList(), null);

            GroupMachine_cmb.DataSource = b4;
            GroupMachine_cmb.ResetText();

            Machine_dgv.ClearSelection();

            Update_btn.Enabled = false;

            Delete_btn.Enabled = false;
        }
        private void Clear_btn_Click(object sender, EventArgs e)
        {
            Machine_dgv.DataSource = null;

            GroupMachine_cmb.ResetText();
        }