c# - When does the .csproj file get updated? -

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i open solution file in vs2010, right click on project, go build tab , switch .net framework (say) 4 2. save all. .csproj doesn't change - still says 

<targetframeworkversion>v4.0</targetframeworkversion>

why this? , have line update?

right-click on project within vs2010, select properties , set target framework .net framework 2.0. vs close/reopen app , should go. i'm not sure mean to go build shouldn't have explicitly click save all.

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