Use SqlAdapter and DataSet to perform bulk updates to SQL table

Question

Below is the code I'm using to bulk update (about 14k records) our ZipCodeTerritory table. The code runs fine, without any exceptions, however when I check the table after the connection is closed I see that none of the changes have been made.

I am holding all the records that need to be updated in the List object I pass between methods. I use this List to fill the DataTable and place that into a DataSet to perform the update.

This is my first attempt trying to use this technique so any suggestions greatly appreciated.

private static string selectCommand =
   "SELECT ChannelCode, DrmTerrDesc, IndDistrnId, StateCode, ZipCode, EndDate, 
     EffectiveDate, LastUpdateId, LastUpdateDate, Id, ErrorCodes, Status FROM
     ZipCodeTerritory";

private static string updateCommand = "UPDATE ZipCodeTerritory SET ChannelCode =
                                      @ChannelCode, DrmTerrDesc = @DrmTerrDesc,
                                      IndDistrnId = @IndDistrnId," + 
                                      "StateCode = @StateCode, ZipCode = @ZipCode,
                                      EndDate = @EndDate, EffectiveDate = 
                                      @EffectiveDate," + 
                                      "LastUpdateId = @LastUpdateId, LastUpdateDate
                                      = @LastUpdateDate, ErrorCodes = @ErrorCodes,"
                                      + "Status = @Status " + 
                                      "WHERE Id = @Id";

public static void Update(List<ZipCodeTerritory> updates, Dictionary<ZipCodeTerritory, string> errorList)
{
   using (SqlConnection connection = new SqlConnection(connString))
   {
      using (SqlDataAdapter adapter = new SqlDataAdapter(selectCommand, connection))
      {
         try
         {
            SqlCommand updateCmd = connection.CreateCommand();
            updateCmd.CommandText = updateCommand;
            updateCmd.Parameters.Add(new SqlParameter("@ChannelCode", SqlDbType.Char, 1, "ChannelCode"));
            updateCmd.Parameters.Add(new SqlParameter("@DrmTerrDesc", SqlDbType.Char, 1, "DrmTerrDesc"));
            updateCmd.Parameters.Add(new SqlParameter("@IndDistrnId", SqlDbType.Char, 1, "IndistrnId"));
            updateCmd.Parameters.Add(new SqlParameter("@StateCode", SqlDbType.Char, 1, "StateCode"));
            updateCmd.Parameters.Add(new SqlParameter("@ZipCode", SqlDbType.Char, 1, "ZipCode"));
            updateCmd.Parameters.Add(new SqlParameter("@EndDate", SqlDbType.Char, 1, "EndDate"));
            updateCmd.Parameters.Add(new SqlParameter("@EffectiveDate", SqlDbType.Char, 1, "EffectiveDate"));
            updateCmd.Parameters.Add(new SqlParameter("@LastUpdateId", SqlDbType.Char, 1, "LastUpdateId"));
            updateCmd.Parameters.Add(new SqlParameter("@LastUpdateDate", SqlDbType.Char, 1, "LastUpdateDate"));
            updateCmd.Parameters.Add(new SqlParameter("@Id", SqlDbType.Char, 1, "Id"));
            updateCmd.Parameters.Add(new SqlParameter("@ErrorCodes", SqlDbType.Char, 1, "ErrorCodes"));
            updateCmd.Parameters.Add(new SqlParameter("@Status", SqlDbType.Char, 1, "Status"));
            updateCmd.UpdatedRowSource = UpdateRowSource.None;
            adapter.UpdateCommand = updateCmd;
            adapter.AcceptChangesDuringUpdate = true;
            DataSet ds = LoadDataSet(updates);
            connection.Open();
            adapter.Fill(ds, "ZipCodeTerritory");
            adapter.Update(ds, "ZipCodeTerritory");
            connection.Close();
         }
         catch (Exception ex)
         {
            string msg = ex.Message;
         }                    
      }
   }
}

private static DataSet LoadDataSet(List<ZipCodeTerritory> zipcodeList)
{
   DataSet ds = new DataSet();
   DataTable data = LoadData(zipcodeList);
   ds.Tables.Add(data);
   return ds;
}

private static DataTable LoadData(List<ZipCodeTerritory>zipCodeList)
{
   DataTable dataTable = InitializeStructure();

   foreach (var zipcode in zipCodeList)
   {
      DataRow row = dataTable.NewRow();

      try
      {
         row[0] = zipcode.ChannelCode.Trim();
         row[1] = zipcode.DrmTerrDesc.Trim();
         row[2] = zipcode.IndDistrnId.Trim();
         row[3] = zipcode.StateCode.Trim();
         row[4] = zipcode.ZipCode.Trim();
         row[5] = zipcode.EndDate.Date;
         row[6] = zipcode.EffectiveDate.Date;
         row[7] = zipcode.LastUpdateId;
         row[8] = DateTime.Now.Date;
         //row[9] = zipcode.Id;
         row[10] = zipcode.ErrorCodes;
         row[11] = zipcode.Status;
      }
      catch (Exception ex)
      {

      }
      dataTable.Rows.Add(row);
   }
   return dataTable;
}

private static DataTable InitializeStructure()
{
   DataTable dt = new DataTable();

   dt.Columns.Add("ChannelCode", typeof (string));
   dt.Columns.Add("DrmTerrDesc", typeof (string));
   dt.Columns.Add("IndDistrnId", typeof (string));
   dt.Columns.Add("StateCode", typeof (string));
   dt.Columns.Add("ZipCode", typeof (string));
   dt.Columns.Add("EndDate", typeof (DateTime));
   dt.Columns.Add("EffectiveDate", typeof (DateTime));
   dt.Columns.Add("LastUpdateId", typeof (string));
   dt.Columns.Add("LastUpdateDate", typeof (DateTime));
   dt.Columns.Add("Id", typeof (int));
   dt.Columns.Add("ErrorCodes", typeof (string));
   dt.Columns.Add("Status", typeof (string));
   return dt;
}

EDIT

I've changed the order for the .Fill and LoadDataSet() methods to first load the data from the database as it currently sits and THEN merge the changes into that DataSet. However, I'm now getting the following error:

`Update unable to find TableMapping['ZipCodeTerritory'] or DataTable 'ZipCodeTerritory'`

I realized I hadn't named the table so I changed the InitializeStructure() method to the following

    private static DataTable InitializeStructure()
    {
        DataTable dt = new DataTable("ZipCodeTerritory");

However.... now when I attempt the .Update on this line

 adapter.Update(ds, "ZipCodeTerritory");

I get this exception:

Update requires a valid InsertCommand when passed DataRow collection with new rows.

SECOND EDIT

I've added the following InsertCommand to the Update method (this is the first few lines of code inside the try that contains the updateCommand):

    SqlCommand insertCmd = new SqlCommand(insertCommand, connection);
    insertCmd.CommandText = updateCommand;
    insertCmd.Parameters.Add(new SqlParameter("@ChannelCode", SqlDbType.Char, 1, "ChannelCode"));
    insertCmd.Parameters.Add(new SqlParameter("@DrmTerrDesc", SqlDbType.NVarChar, 30, "DrmTerrDesc"));
    insertCmd.Parameters.Add(new SqlParameter("@IndDistrnId", SqlDbType.Char, 3, "IndDistrnId"));
    insertCmd.Parameters.Add(new SqlParameter("@StateCode", SqlDbType.Char, 3, "StateCode"));
    insertCmd.Parameters.Add(new SqlParameter("@ZipCode", SqlDbType.Char, 9, "ZipCode"));
    insertCmd.Parameters.Add(new SqlParameter("@EndDate", SqlDbType.Date, 10, "EndDate"));
    insertCmd.Parameters.Add(new SqlParameter("@EffectiveDate", SqlDbType.Date, 10, "EffectiveDate"));
    insertCmd.Parameters.Add(new SqlParameter("@LastUpdateId", SqlDbType.Char, 8, "LastUpdateId"));
    insertCmd.Parameters.Add(new SqlParameter("@LastUpdateDate", SqlDbType.Date, 10, "LastUpdateDate"));
    insertCmd.Parameters.Add(new SqlParameter("@Id", SqlDbType.Int, 20, "Id"));
    insertCmd.Parameters.Add(new SqlParameter("@ErrorCodes", SqlDbType.VarChar, 255, "ErrorCodes"));
    insertCmd.Parameters.Add(new SqlParameter("@Status", SqlDbType.Char, 1, "Status"));

    adapter.InsertCommand = insertCmd;

However I am still not seeing any changes in the database.