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Possible Duplicate:
Do the amount of namespaces affect performance?
When you create a new class in C#, the default template includes several using lines at the top for LINQ and a couple others. Does having the namespaces included cause the application use more resources at run-time?
I rarely use anything in the LINQ namespace and I want to make sure I’m not paying the price for something I’m not using if I leave the lines there.
It will not have any runtime performance. It’s purely used during the compilation period (to find appropriate classes).
By the time C# code is compiled into IL, namespaces themselves don’t exist anyway.