c# - The primary reference "Microsoft.CSharp", which is a framework assembly, could not be resolved in the currently targeted framework -


i started new winforms project, simple, has few labels, text boxes, , button. code running fine. forgot change framework version 4 (using vs 2010) 3.5 before created app , when changed 3.5 or 3.5 client profile following warning:

the primary reference "microsoft.csharp", framework assembly, not resolved in targeted framework. ".netframework,version=v3.5". resolve problem, either remove reference "microsoft.csharp" or retarget application framework version contains "microsoft.csharp".

it's not huge amount of trouble recreate 3.5 setting start , i'm sure i'm not using 4 framework need.

in most/all project templates in vs 2010 .net 4, microsoft.csharp assembly reference added. when created project given assembly reference automatically. shouldn't have problems removing reference.


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