Importing name space withouth use , effect performance?

Is there any deficiency performance if import a lot of name space in Web.config or in every single cs file while it's no开发者_如何学编程t necessary to be in all classes ?

Thank you

Short answer: No, there shouldn't be any runtime performance impact. 'import' is a compiler directive that is more related to compilation.

However depending on the nature of the way you deploy your website/webapp, the compilation might take place during 'production' and hence might have some influence, though I would not think it'll be much.