Cause:
The Redundant namespace reference code issue highlights unused namespace references that can be safely removed in gray (dead code issue), which may improve readability.
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The Sort Namespace References refactoring is a stand-alone part of the Optimize Namespace References refactoring. In contrast to that refactoring, the Sort Namespace References refactoring doesn’t remove any references, and as the name says, it just sorts the ‘using’s (C#) or ‘Imports’ (VB) statements in the active source file.
The following sorting methods are available:
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