Why remove unused using directives in C#?

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There are a few reasons you’d want to take them out.

  • It’s pointless. They add no value.
  • It’s confusing. What is being used from that namespace?
  • If you don’t, then you’ll gradually accumulate pointless using statements as your code changes over time.
  • Static analysis is slower.
  • Code compilation is slower.

On the other hand, there aren’t many reasons to leave them in. I suppose you save yourself the effort of having to delete them. But if you’re that lazy, you’ve got bigger problems!

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