asp.net DropDownList 控件显示多列

DataTable dt = new EnteUserBll().GetList(strWhere).Tables[0];
if (dt != null && dt.Rows.Count > 0)
{
dt.Columns.Add("NewColumn", typeof(string));
foreach (DataRow dr in dt.Rows)
{
dr["NewColumn"] = dr["FName"] + "(工号:" + dr["LoginName"] + ")";
}
cbAgentList.DataSource = dt;
cbAgentList.DataTextField = "NewColumn";//绑定姓名
cbAgentList.DataValueField = "FID";//绑定工号
cbAgentList.DataBind();
}