c# - System.core dll can not be referenced -

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i trying solve dlls reference problem in visual studio 2012. dlls have set them self in way looking .net 4.0 version while can not install because have .net 4.5 installed visual studio 2012.i have asked this question

but didnt proper answer.now trying reference system.core in 4.5 can not referenced visual studio not allowing me do, says referenced automatically during project build not.i in catch 22 situation.kindly advise. have reinstalled visual studio 2012 didn't help.

zara, i've looked @ download link provided , appears me it's windows8. windows7 , windows8 different in how handle things wouldn't dream of trying install such sdk on windows7 machine.

my suggestion therefore try uninstall sdk , might work again. if sdk works windows8 there no use having installed on windows7 machine. windows7 @ keeping backups of files replaces when installing sdks , other things uninstalling sdk might restore before , might fine after that.

if doesn't make difference suggest reinstalling .net 4.5 after uninstalling win8 sdk.


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