i opened a project and edited it and then i opened another copy of that project at the same time and some kind of message came up about the file being changed and whether i want to update the current file to the old file and i dont remember whether i said YES or NO, but after i opened the project it looks like it did not save my previous changes! is there any way to recover what i did/
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Source control. Backups. When you edit a file outside of VS (or another copy of VS) VS will track cahnges made to the file. You can have VS not refresh the file.