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Asked: 2026-05-12T14:39:38+00:00

I created this simple textpad program in WPF/VB.NET 2008 that automatically saves the content

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I created this simple textpad program in WPF/VB.NET 2008 that automatically saves the content of the forms to an XML file on every keystroke.

Now, I’m trying to make the program see the changes on the XML file in realtime.. example, If I open two of my textpads, when I write on the first one, it will automatically reflect on the other textpad.

How can I do this?

One of my colleagues told me to read about iNotifyPropertyChanged (which I did) but how can I apply it to my application..?

🙁 help~

btw, I got the idea from a Google Wave demo, and I’m actually trying to do something bigger..

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  1. Editorial Team

    Note – this approach will be really, really expensive in terms of disk I/O, memory usage and CPU time. Why are you using XML is that the native format of the data you are editing? You may want to look at a more compact format – one that will use less memory, generate fewer I/Os and use less CPU.

    Also note that you writer may need to flush the file for the watcher to notice any changes. This is expensive as well – especially if you re doing it on every key stroke.

    Be sure to use the correct file open attributes (sharing, reading and writing).

    You may want to consider using shared memory to communicate between your processes. This will be less expensive. You can avoid large ammounts of disk I/O by only writing changes to disk when the use asks to commit them, or there is a hint to do so. I suggest avoiding doing this on every key stroke.

    Remember, your app needs to be a good system citizen and consume a reasonable amount of system resources. This is especially true running on netbooks and other ‘low spec’ systems.

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