Re: Using XML file as a data source - concurrency problem?

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From: Scott Allen (bitmask_at_[nospam)
Date: 07/29/04 

Date: Thu, 29 Jul 2004 10:14:24 -0400

Hi Artur:

I don't have a good answer to your question, but I would suggest you
poke around the source code for dasBlog:
http://www.gotdotnet.com/Community/Workspaces/workspace.aspx?id=77a29128-4746-4473-b676-e4f1517a1907

dasBlog uses an XML file as a datasource and judging by it's
popularity on the web it is relatively scalable. I imagine with some
careful caching techniques and synchronization one can pull it off. 

--
Scott
http://www.OdeToCode.com
On Thu, 29 Jul 2004 12:44:02 +0300, "Artur Sorszegi"
<artursorszegi@freemail.hu> wrote:
>Hi!
>
>There a lot of examples and talk about using an XML file as a datasource.
>Given a DataSet object, you can easily load data from the XML file, and
>display it in for example a DataGrid, or bind the data to other controls.
>You could even edit the data, and save it back using the DataSet objects'
>WriteXml method. But these resources fail to specify one thing, namely, if
>this causes any problems when multiple users use the application at the same
>time? I think you could use the expression concurrency problem for it, where
>two users start using the data at the same time (for example), and both make
>changes, first the first saves it, then the second. My feeling is, that this
>could overwrite changes by one user with changes of the other.
>
>Is this really so? Can it be prevented? In many cases, an XML file could
>server just as well as a database, but having this problem, and not even
>knowing if it works, make it not a so good solution.
>
>I assume, that page requests can be processed in parallel by ASP.NET (or
>else this would not be a problem).
>
>Anyone, any ideas?
>
>Thanks
>

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