Memory Issues in my Ipad Application

Hi,
I have a main UIView (Say MainView)which holds the subviews[Other modules of the app]. If i add a new subview to MainView , i'm releasing the memory of that subview's controller(Say Controller_1) after adding its view(Controller1View) as a subview to the MainView also if i'm going to add some other new view(Controller2view) i'm removing the existing subview(Controller1View) from the superview.
If i'm again adding the controller_1's view as a subview , the allocations[In the instruments tool] is showing the number of live objects of Controller_1 as 2.
Why is it so? I'm releasing the controller's memory whenever i have added its view as a subview to mainview. It should be one right.Since i'm having only one instance of the controller @ a time.
Pls Help Me..

You have posted an iOS programming problem in the OS X Leopard's Printing, faxing, and scanning forum. There is a developer's forum in which you should post such questions. Questions regarding iOS programming should be posted in the forums at developer.apple.com. Membership is required but it is free.
If you are a paying iOS developer, then log into their dedicated forums for help.

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               logger.info("vo.getName()" + vo.getName());
               project.setNumberString(vo.getId());
               BNDetail detailObj = project.getDetailForKey("TABLE-NAME"); // required
               setDetailFields(vo, detailObj);//this method gets the value from vo and sets in the detail_up object
               FNClientSessionManager.commit(unitOfWork);
               updated = true;
               unitOfWork.release();
          } catch (Exception e) {
               logger.warn("update: caused exception, "
                         + e.getMessage());
               unitOfWork.release();
          return updated;
     }Now I have tried to change little bit in the code. And I added the following lines:
                    updated = true;
                 FNClientSessionManager.release(unitOfWork);
                 project_hist=null;
                 detail=null;
                 history=null;
                 project=null;
                 detailObj=null;
                    unitOfWork.release();
                    unitOfWork=null;
                 expressionBuilder=null;
                 ex1=null;
                 ex2=null;
                 finalExpression=null;
and also I added the code to request the Garbage collector after every 5th update:
if (updateInfo(vo, user)){
                           logger.info("project update : "+ rs.getString("number_string"));
                           projCount++;
                           //call garbage collector every 5th record update
                           if(projCount%5==0){
                                System.gc();
                                logger.debug("Called Garbage Collectory on "+projCount+"th update");
                      }But now the code wont even update the single record. So please look into the code and suggest me something so that I can stop banging my head against the wall.

Memory Issues in my Ipad Application

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