Hi,

I am facing memory leak problem when using SF BusinessObject and DevExpress ASPxDataGridView.

I have simple test project, which only has one BO, bind to ASPxDataGridView. It does nothing complicated, just load all records in Page_Load if not IsPostBack.



I found that, the memory usage would become double when I just "refresh" the page. I also used dotTrace profiler and found that # of BO instances keep increasing. I suspect it is the same issue with the post http://forum.strataframe.net/Topic20903-8-1.aspx.



I have prepared sample project and the dotTrace memory profiler files for your reference. MemoryLeak1.dtm is first load memory snapshot and MemoryLeak2.dtm is 2nd snapshot after refresh.



As the file size > 30MB, please download it from http://www.visualsolutions.com.my/blog/chankk/WebApplication6.zip



Hope you could get back to me as soon as possible! It is very urgent!



Thank you

Sorry, one more week past. Any update?



Thank you

Chan,

We have not reproduced your memory leak as we had mentioned in the previous comment on this topic.  In regards to your error posted about saving...I think that at this point you may be a little "gun-shy" as this has not changed in the framework in some type.  You are more than welcome to give me steps to reproduce this, but this hasn't changed, Chan.  As I mentioned in my previous post, we cannot reproduce a memory leak nor is there an issue with the transactional saves.  You may forget that we are not only framework developers, but also use the framework in developing a major medical application.  The version to which you are saying you are receiving an error regarding transactions is pushed out into the field and we use transactions heavily in all of our transaction posting.  So I am VERY confident in this code. I think that you have a cross section of assemblies from different versions or something with your structures or SPROCs that could potentially be cuasing this.  As you well know, StrataFrame is a framework for developers which means that many times when an error occurs it has nothing to do with the framework but something within the environment or code that has been developed.  This is always a balancing act to find out exactly where an issue may be occuring.  If you can provide steps to reproduce this then we will most definitely do so.  Otherwise there is nothing I can do to help.

Hi,

As mentioned in PM, the actual problem of Save transaction is "object reference is not set" during DataLayer.Save(). After some debugging, I found that if my web form contains more than one BO and I save all of them in a loop (within transaction), the 2nd BO.Save() will be failed.



It is caused by the connection and transaction object is null at the point of code as below.







The cause of both references are null, I suppose, is caused by this code







As I see the cloned command object is assigned back to same variable. Then, the command.Connection is set to null as clean up.



What do you think? Please advice.



Thank you

Hi,

After further thinking, don't feel loCommand = loCommand.Clone() can cause this problem. hmmm...

Agreed.  The Clone should not cause an issue as it creates a unique instance which is then fully autonomous from the other instance.

Hi,

Any hint how to troubleshoot on this?



Thank you

Well, this thread is getting a bit ambiguous.  I was just commenting on your Clone comment.  In regards to the core of your issue, are you referring the SqlTransaction error?  The error, which you have already learned, is going to be specific to something that you are doing within your code.  So the questions to work through are:

• When are you creating a transaction?
• Is it possible for the same code to be called at the same time?
• Are the objects in question specific to a session or the application?
• Are you using shared data tables?
• If you turn off transactions do your issues go away?

These are types of things that you need to be asking yourself.  Only you know your exact code and what you have done at this point.  This code is going to be related to your specific application.  So I would begin to work through these questions.