.net - Do Redundant Namespaces incur any overhead -

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In addition to the maintenance complexity (and I argue that there is no one less), and the fact that it is a clean solution (I agree with this). In respect of memory / space / etc. in the designated namespaces, to import in any upper part? For example, if I import my namespace, but do not open them

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When you add assembly reference or use the 'use' keyword , Then csc.exe will ignore all those legislations that you have not actually created