NSOperation performance

I am trying to server side connection on a background thread us开发者_C百科ing NSOperation. I didn't want to subclass NSOperation ..So how can use NSOperation and how to return response from NSOperation...

Any Ideas about this?

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since NSOperation is an abstract class there is no way to use NSOperation without using a subclass of NSOperation.
If you don't want to subclass yourself you can use one of the NSOperation subclasses (ie NSInvocationOperation, or NSBlockOperation).

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Here is a good example where to start: Cocoa Tutorial: NSOperation and NSOperationQueue