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Can I use .net 3.5 binaries for a library with a .net 4.0 application / what are the negatives if any? In other words is there any reason I should take more time out to download source for the library and build it under .net 4.0 (assuming it builds without any problems I guess) as opposed to downloading the .net 3.5 binaries.
I’m using C# in VS2010.
thanks
.NET 4.0 is compatible with .NET 3.5 and earlier, but as comments below indicate, best practice would be to recompile with .NET 4.0 when you can.
It is safe (and intended) that you can use assemblies targeting older versions of the framework.