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how can i use it now ?
Like i used stopwatch = new Stopwatch(); but with this loop how ?
That's going to depend on exactly what you are trying to do - and we have no idea what that is!
So sit down and think about the problem you are trying to solve before you decide what to code: creating a bunch of stopwatches is one thing, but you need to consider what you are going to use them for rather than a simple "how do I do it?"
Certainly, creating ten stopwatches in a property that returns a single one probably isn't what you want to do at all!