Winforms 使用bindingsource填充组合框

在windows窗体上，所有文本框和组合框都是从acctPackageBindingSource绑定的。我的问题是组合框中的biniding只显示int值，这意味着它来自acctPackage。我想显示这个名称，它表示该值的“Displaymember”。来自不同表名的是sysCode。因此，如何才能完美地显示显示成员。下面是我的代码

 // Here the all value is coming form Syscode table .

  public void FillDropDown()
    {
        if (_commonComponent == null)
            _commonComponent = new CommonComponent();

        List<SysCode> _syscode = _commonComponent.GetByTableCodeForIncomeDedMapping("19");
        bindingSourceSysCode.DataSource = _syscode;

        packageCodeComboBox.DataSource = bindingSourceSysCode;
        packageCodeComboBox.DisplayMember = "Desclong2";
        packageCodeComboBox.ValueMember = "PackageCode";

    }



//This part is bind my all value on the form 

  private void FillAcctPackage()
    {
        if (_commonComponent == null)
            _commonComponent = new CommonComponent();

        acctPackageBindingSource.DataSource = _commonComponent.GetAcctPackge();



    }