OleDbConnection ^connection = gcnew OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Provider=Microsoft.ACE.OLEDB.12.0;Data Source=database1.accdb;Persist Security Info=False;");
  connection->Open(); //apro la connessione con il db

  //seleziono id pratiche
  OleDbCommand ^cmd = gcnew  OleDbCommand("SELECT ID_PRATICHE " + "FROM APPARTIENE", connection);  
  OleDbDataReader ^ read = cmd->ExecuteReader();
  flag = 0;
  MessageBox::Show ("data: "+ read->GetValue(0));