test.cs

private void Mm_BlockRowMerged(
	object sender,
	TXTextControl.DocumentServer.MailMerge.BlockRowMergedEventArgs e) {
			
  using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) {
    tx.Create();
    tx.Load(e.MergedBlockRow, TXTextControl.BinaryStreamType.InternalUnicodeFormat);

    // find all tables in a block and flag cell 1,1
    if (tx.Tables.GetItem() != null) {
      tx.Tables.GetItem().Cells.GetItem(1, 1).Name = "block_identifier";
    }

    byte[] data;

    tx.Save(out data, TXTextControl.BinaryStreamType.InternalUnicodeFormat);
    e.MergedBlockRow = data;
  }

}