binding two combo boxes

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C#

Hello

I have combined two combo boxes but I need to combine them like this flow



then select item type -- AA, BB, CC


after that in third combo it should list in description of items regarding

AA - abdbdbfbd
BB - dhjhdfdhf

private void cmbItemType_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (cmbItemType.SelectedValue != null && cmbWharehouse.SelectedValue != null)
            {
                loadGrid(cmbWharehouse.SelectedValue.ToString(), cmbItemType.SelectedValue.ToString());
            }
        }

load the combo

private void loadItemTypeCombo()
        {
            List<Entity.beanItem> _list = new List<Entity.beanItem>();
            _list = _brItemType.getItem();

            this.cmbItem.ValueMember = "TYPE";
            this.cmbItem.DisplayMember = "DESCRIPTION";
            this.cmbItem.DataSource = _list;

        }

public class brItem
{

Dataaccess.DAItem _da = new Dataaccess.DAItem();
public List<entity.beanitem> getItem()
{
List<entity.beanitem> _list = new List<entity.beanitem>();
try
{

DataSet ds = _da.getItem();
if (ds != null)
{
Entity.beanItem _bnnew = new Entity.beanItem();

_bnnew.ITEMCODE = "ALL";
_bnnew.TYPE = "ALL";
_bnnew.DESCRIPTION = "ALL";

_list.Add(_bnnew);

foreach (DataRow dr in ds.Tables[0].Rows)
{
Entity.beanItem _bn = new Entity.beanItem();

_bn.ITEMCODE = dr["ITEMCODE"].ToString();
_bn.DESCRIPTION = dr["DESCRIPTION"].ToString();
_bn.TYPE = dr["TYPE"].ToString();

_list.Add(_bn);

}

}

}
catch (Exception)
{

throw;
}

return _list;
}