当从SQL (c#)加载到组合框时无法设置Datatextfield和dataValuefield

我有方法，我检索数据表，我正在尝试加载到组合框，它工作正常，但我无法设置Datatextfield和DataValuefield当我尝试它显示错误指示不包含定义。

下面是检索数据表

方法的代码片段

DataTable dtTable = new DataTable();
            using (SqlConnection sqlConnection = new SqlConnection(cs))
            {
                using (SqlCommand sqlCommand = new SqlCommand("SELECT Id,CampaignName FROM CampaignsTable", sqlConnection))
                {
                    sqlConnection.Open();
                    using (SqlDataReader sqlDataReader = sqlCommand.ExecuteReader())
                    {
                        dtTable.Load(sqlDataReader);
                        sqlDataReader.Close();
                    }
                }
            }
            return dtTable;

加载到组合框

的代码片段

drpDownProfiles.DataSource = rank.RetrieveProjectNames();
drpDownProfiles.DataTextField = "Not Working";
drpDownProfiles.DataValueField = "Not Working";

drpDownProfiles.DataTextField = "Not Working";
drpDownProfiles.DataValueField = "Not Working";

drpDownProfiles.DataTextField = "CampaignName";
drpDownProfiles.DataValueField = "Id";