if (toReport is IReportableParam)
{
   IReportableParam rp = (this.toReport as IReportableParam);
   if (rp.Parameters != null)
   {
      foreach (Pair reppar in rp.Parameters)
      {
         try
         {
           this.crystalReportViewer1.ParameterFieldInfo[(string)reppar.first].CurrentValues.AddValue(reppar.second);
         }
         catch (Exception exc)
         {
           logger.Log.Warn("impossibile settare il valore per il parametro " + (string)reppar.first);
         }
      }
    }
  }
  this.crystalReportViewer1.Show();