Question

When I decompile my assemblies in JustDecompile, I find that they are referencing multiple versions of some .NET libraries.

Here is an example (mscorlib, System.Drawing and System.Windows.Forms are referenced twice):

mscorlib, Version=2.0.0.0
mscorlib, Version=4.0.0.0
System, Version=4.0.0.0 
System.Core, Version=4.0.0.0
System.Data, Version=4.0.0.0
System.Drawing, Version=2.0.0.0
System.Drawing, Version=4.0.0.0
System.Windows.Forms, Version=2.0.0.0
System.Windows.Forms, Version=4.0.0.0

Can someone give me an explanation as to why this is happening?

Thanks

Answer 1

That would happen if they write a .Net 4.0 application that uses a third-party library build for .Net 2.0.