从SQL（C＃）加载到ComboBox时无法设置Datatextfield和dataValuefield

Question

I have method where I retrieve datatable and I am trying load to combobox and it works fine but I am unable set Datatextfield and DataValuefield when I try to it shows error indicating does not contain defintion.

here is code snippet of method to retrieve datatable

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;

Below Code Snippet on Loading to combobox

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

Answer 1

These two properties:

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

should be set up like:

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