Checking this will enable the Auto Refresh feature on the webpart.
The Auto Refreshing Interval is the time interval in which webpart will get refreshed automatically.
Implementation: To demonstrate the implementation I created a custom list and added several items.
Nice article, but I have made some changes in my project on it: Your code doesn't work in designer.
This feature is available out of the box in Share Point 2010 and no additional development is required.