Re: Simple WinForm ( Not Responding ) Refesh Issue C# 2.0

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On Thu, 13 Sep 2007 22:15:52 +0200, OZI <sql_agentman@xxxxxxxxxxx> wrote:

Morten,

Application.DoEvents() did everything I need.
You are right I don't need the Refresh();

However, I wish I understand what does that mean. I need help
understanding what does Application.DoEvents() mean and why it solved my
Problem.

I will also look into the BackgroundWorker solution, As soon as I have time
and the "big cheese" goes invisible, I think that would be best on the long
run?

Thank you so much for your help.

OZI


Windows is event driven, which all the little things you see on the user interface is done by firing a whole bunch of various events. However, a regular application is also single threaded, which means executing event handling has to compete with regular code. This works fine in most cases where methods do not do much and is executed within a second or less, which means, if you click a button right after you start a method, the button click might event might not get handled until the one second method is done processing. This becomes very noticeably when the method takes a lot more than one second, making the user interface appear sluggish or non responsive as everything the user does to the interface creates a queue of waiting events (Windows discards windows events that aren't processed within a certain timelimit so the click might not execute at all). This queue will be processed when your method is finished processing. Application.DoEvents() pauses your method and lets the
application process any waiting events, and will continue the method when the events are processed. Calling Application.DoEvents every so often (several times per second) will keep the GUI responsive, and is very handy in a simple loop where each turn does not take much time. If each turn takes too long you need to put the entire loop in a separate thread, which is were the BackgroundWorker comes into play.

--
Happy coding!
Morten Wennevik [C# MVP]
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