I am implementing a Windows Service. I did a foolish mistake. I opened the design view of windows service and drag-and-drop the Timer from toolbar. Because I need the windows service to execute some code periodically. I found the timer won't triggered at all. I found that is Timer in Windows.Forms. It never works in Windows Service. You need to create a timer of System.Timers. Like the example following:

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I found the jQuery validation is very good! Moreover, that is very easy to customize the error message. You just need to put the message in the "title" attribute.
e.g.

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We built a tool to check network information in your Android. It will find out all internal IP addresses and the external address. That is very useful for your developer and to do security audit.
By the way, I found even I am using 3G to connect internet. It only has a private network address!
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Scan this QRCode

I am building a Joomla Component. I found there are some Javascript errors in core.js when I click the actions. I have found out these two variables are required.

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When I install a new plug-in, I got this error:
"JFolder::create: Could not create directory plug-in"
Later, I found out the cause. The parameters in configuration.php are not configured correctly.
Please make these two lines in configuration.php pointed to the correct directory.

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