The default answer to this question is probably Refactor! since this tool is also endorsed by Microsoft as the "official" VB refactoring. However, being a free tool, it never comes close to the strength of other commercial tools, such as ReSharper or Refactor! Pro .
By the way: while I definitely advise you to try all these tools, I must also say that they make the IDE much, much slower. If your car is fast enough to handle it, go ahead and get an extra performance boost. However, I currently do not use any of these tools (despite the fact that I spent money on a Refactor! Pro subscription), because my (virtual) machine cannot handle the load.
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