TempData is not clearing as expected?

Just adding this as I said in my comment. I suggest to do.

Microsoft has made a change to the behavior of TempData that we need to be aware of in MVC 2 and 3. TempData now no longer completely clears at the end of a controller action cycle. TempData can now (automatically and without you changing anything) persist through to other pages.

TempData keys are now only cleared if they’ve been read. Furthermore, if you use RedirectResult or RedirectToRouteResult, they will persist even if they are read.

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