[SharePoint 2010] Copy list item with version history and attachment

         private void MoveItem(SPListItem sourceItem, SPListItem destinationItem)
         {
             if (sourceItem == null || destinationItem == null) return;

             destinationItem = GetDestinationItem(sourceItem.ID, destinationItem);

             SPFieldLookup lkpField = null;
             SPFieldLookupValue lkpFieldVal=null;
             object fieldVal = null;
             SPUser systemAccount = destinationItem.Web.AllUsers["SHAREPOINT/system"];
             SPWeb sourceWeb = sourceItem.Web;
             SPWeb destWeb = destinationItem.Web;

             Log("-----Begin of handle item-----");

             Log(string.Format("----------Source item [{0}/{1}]----------", sourceItem.Title, sourceItem.ID));

             #region Handle version history

             for (var i = sourceItem.Versions.Count - ; i >= ; i--)
             {
                 foreach (SPField sourceField in sourceItem.Fields)
                 {
                     SPListItemVersion version = sourceItem.Versions[i];
                     fieldVal = version[sourceField.InternalName];

                     Log(string.Format("----------Handle field[{0}/{1}]----------", sourceField.InternalName, sourceField.Type.ToString()));

                     if (sourceField.Type == SPFieldType.User)
                     {
                         fieldVal = GetSPUserFromString(new SPFieldUserValue(sourceWeb, fieldVal.ToString()), destWeb);
                         Log(string.Format("----------user field[{0}/{1}]----------", sourceField.InternalName, fieldVal));
                     }

                     if (sourceField.Id == SPBuiltInFieldId.Created ||
                        sourceField.Id == SPBuiltInFieldId.Created_x0020_By ||
                        sourceField.Id == SPBuiltInFieldId.Modified ||
                        sourceField.Id == SPBuiltInFieldId.Modified_x0020_By ||
                        sourceField.Id == SPBuiltInFieldId.Author ||
                        sourceField.Id == SPBuiltInFieldId.Editor)
                     {
                         destinationItem[sourceField.InternalName] = fieldVal;
                     }
                     else if (!sourceField.ReadOnlyField && sourceField.Type != SPFieldType.Attachments)
                     {
                         if (sourceField.Type != SPFieldType.Lookup)
                         {
                             destinationItem[sourceField.InternalName] = fieldVal;
                         }
                         else
                         {
                             lkpField = sourceField as SPFieldLookup;

                             Log(string.Format("----------source field value[{0}]----------", fieldVal));

                             if (lkpField != null && fieldVal != null && fieldVal.ToString().Length > )
                             {
                                 lkpFieldVal = new SPFieldLookupValue(fieldVal.ToString());
                                 destinationItem[sourceField.InternalName] = lkpFieldVal;
                             }
                         }
                     }
                 }

                 //update destination item
                 destinationItem.Update();

                 Log("----------End of handle field----------");
             }

         private SPListItem GetDestinationItem(int sourceItemID, SPListItem destinationItem)
         {
             SPList list = DestinationList;

             if (sourceItemID - CurrentItemID > )
             {
                 for (int i = CurrentItemID + ; i < sourceItemID; i++)
                 {
                     SPListItem item = list.Items.Add();
                     item[SPBuiltInFieldId.Title] = "-1";

                     item.Update();
                 }
                 return list.Items.Add();
             }
             else
             {
                 return destinationItem;
             }
         }

         private SPUser GetSPUserFromString(SPFieldUserValue userVal, SPWeb web)
         {
             try
             {
                 if (userVal != null)
                     return web.EnsureUser(userVal.User.LoginName);
                 else
                     return null;
             }
             catch
             {
                 return null;
             }
         }