Why Petshop Changed all static methods to instance methods when upgrading from version 3.0

Is it because of perfomance or something else?
I was confused when to use static methods and when to use instance.

Please give me some points. Thanks.I haven't looked at Pet Shop in some time so I'm not sure what the current
design looks like. In general static methods will outperform instance methods,
but this is a general statement and has to be tested against specific code.

Really, the decision between an instance or static method should be a design
decision and not based on performance.

If your class represents an object (a Customer, a TextBox, a Message), then
your methods & properties should be instance methods & properties. Static
members are generally used as shortcut or helper methods (like Thread.CurrentThread
or HttpContext.Current). These methods return an object using a static member
as a shortcut.

--
Scott
http://www.OdeToCode.com/blogs/scott/

> Is it because of perfomance or something else?
> I was confused when to use static methods and when to use instance.
> Please give me some points. Thanks.