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How to rename solutions and projects in Visual Studio

1. Don't.

How to rename solutions and projects that were created in Visual Studio

1. Close Visual Studio and don't open it again until I tell you. Visual Studio is not competent at renaming things.
2. Assuming you're using git, clean the working folder to remove anything that's not in version control (this will help the search-and-replace step because it won't have to go through a bunch of generated files)

git clean -fdx