Com.Radaee.Pdf.Document document = new Com.Radaee.Pdf.Document();
                
                document.OpenStream(memStream, null);
                if (document.OpenStream(memStream, "") == 0)
                {
                    for (int i = 0; i < document.PageCount; i++)
                    {
                        Com.Radaee.Pdf.Page page = document.GetPage(i);
                        page.ObjsStart();
                        for (int j = 0; j < page.AnnotCount; j++)
                        {
                            Com.Radaee.Pdf.Page.Annotation annot = page.GetAnnot(j);
                            if (annot.CheckStatus >= 0)
                            { //checkbox/radio form
                                int checkstatus = annot.CheckStatus;
                                if ((checkstatus == 2) || (checkstatus == 3)) //E' un radiobox
                                {
                                    string fieldName = annot.FieldName;
                                    if (annot.ReadOnly)
                                        continue;

                                    string fieldCurrentValue = Convert.ToString(checkstatus);

                                    if (oldAcrofieldsValues == null)
                                    {
                                        // MODALITA SCORRIMENTO PDF

                                       
                                        if (!acrofields.ContainsKey(fieldName))  // solo 1 volta
                                        {
                                            acrofields.Add(fieldName, fieldCurrentValue);
                                            annot.SetRadio();
                                            Log.Debug("getAcroFieldsStatus", string.Format("Type = e_radio - Field name: {0} value: '{1}'.", fieldName, fieldCurrentValue));
                                            document.Save();
                                        }
                                    }
                                    else
                                    {
                                        // MODALITA RECUPERO MODIFICHE
                                        if (oldAcrofieldsValues.ContainsKey(fieldName))
                                        {
                                           
                                            if (!acrofields.ContainsKey(fieldName))  // solo 1 volta
                                            {
                                                // se il valore è uguale a quello di prima non faccio nulla
                                                if (oldAcrofieldsValues[fieldName].ToString() == fieldCurrentValue)
                                                    continue;

                                                acrofields.Add(fieldName, fieldCurrentValue);
                                                annot.SetRadio();
                                                document.Save();
                                                Log.Debug("getAcroFieldsStatus", string.Format("Type = e_radio - Field name: {0} value: '{1}'.", fieldName, fieldCurrentValue));
                                            }
                                        }
                                    }
                                }//Radio
                                if ((checkstatus == 0) || (checkstatus == 1)) //E' un checkbox
                                {
                                    string fieldName = annot.FieldName;
                                    if (annot.ReadOnly)
                                        continue;
                                    
                                    string fieldCurrentValue = Convert.ToString(checkstatus);
                                    if (oldAcrofieldsValues == null)
                                    {

                                        // MODALITA SCORRIMENTO PDF
                                        if (acrofields.ContainsKey(fieldName))
                                            acrofields[fieldName] = fieldCurrentValue;
                                        else
                                            acrofields.Add(fieldName, fieldCurrentValue);

                                        annot.SetCheckValue(Convert.ToBoolean(checkstatus));
                                        document.Save();
                                        Log.Debug("getAcroFieldsStatus", string.Format("Type = e_check - Field name: {0} value: '{1}'.", fieldName, fieldCurrentValue, fieldCurrentValue, annot.Name));
                                    }
                                    else
                                    {
                                        // MODALITA RECUPERO MODIFICHE
                                        if (oldAcrofieldsValues.ContainsKey(fieldName))
                                        {
                                           
                                                if (Convert.ToString(oldAcrofieldsValues[fieldName]) == Convert.ToString(fieldCurrentValue))
                                                    continue;
                                            

                                            if (acrofields.ContainsKey(fieldName))
                                                acrofields[fieldName] = fieldCurrentValue;
                                            else
                                                acrofields.Add(fieldName, fieldCurrentValue);

                                            annot.SetCheckValue(Convert.ToBoolean(fieldCurrentValue));
                                            document.Save();
                                            Log.Debug("getAcroFieldsStatus", string.Format("Type = e_check - Field name: {0} old value: '{1}' new value: '{2}'.", fieldName, oldAcrofieldsValues[fieldName], fieldCurrentValue));
                                        }
                                    }
                                }
                            }
                            if (annot.EditType > 0)
                            {
                                string fieldName = annot.FieldName;
                                string fieldCurrentValue = null;

                                if (annot.EditText != null)
                                    fieldCurrentValue = annot.EditText;

                                if (oldAcrofieldsValues == null)
                                {
                                    // MODALITA SCORRIMENTO PDF
                                    if (acrofields.ContainsKey(fieldName))
                                        acrofields[fieldName] = fieldCurrentValue;
                                    else
                                        acrofields.Add(fieldName, fieldCurrentValue);
                                    annot.SetEditText(fieldCurrentValue);
                                    document.Save();
                                    Log.Debug("getAcroFieldsStatus", string.Format("Type = e_text - Field name: {0} value: '{1}'.", fieldName, fieldCurrentValue));
                                }
                                else
                                {
                                    // MODALITA RECUPERO MODIFICHE
                                    if (oldAcrofieldsValues.ContainsKey(fieldName))
                                    {
                                        // il "nuovo" valore è null o è stato specificato?
                                        if (string.IsNullOrEmpty(fieldCurrentValue))
                                        {
                                            // no: nuovo valore è "null"
                                            // se quello di prima era "null" allora passo al prossimo
                                            if (oldAcrofieldsValues[fieldName] == null)
                                                continue;
                                        }
                                        else
                                        {
                                            // si: il nuovo valore è stato specificato
                                            // se il vecchio valore era diverso da "null" e uguale al nuovo allora passo al prossimo
                                            if (oldAcrofieldsValues[fieldName] != null && oldAcrofieldsValues[fieldName].ToString() == fieldCurrentValue)
                                                continue;
                                        }

                                        if (acrofields.ContainsKey(fieldName))
                                            acrofields[fieldName] = fieldCurrentValue;
                                        else
                                            acrofields.Add(fieldName, fieldCurrentValue);

                                        annot.SetEditText(fieldCurrentValue);
                                        document.Save();
                                        Log.Debug("getAcroFieldsStatus", string.Format("Type = e_text - Field name: {0} old value: '{1}' new value: '{2}'.", fieldName, oldAcrofieldsValues[fieldName], fieldCurrentValue));
                                    }
                                }
                            }
                        }
                        page.Close();
                    }
                }
                document.Save();
                document.Close();
                Session.PreSignPDF = memStream.Get_data();