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        OleDbDataAdapter ap;
          DataTable dt;


          if(comboBoxMdb.SelectedItem.Equals("ApplicationSettings")) 
          {
            msg = "SELECT ProbeID " +
              "FROM AppSettings";
            dt = new DataTable();
            ap = new OleDbDataAdapter(msg,cn);
            ap.Fill(dt);
            

            foreach(DataRow row in dt.Rows) 
            {
              
              comboBoxProb.Items.Add(row.ToString());
            }
          }