Mono take mscorlib.dll 2.0 instead of 4.0

Question

I am having a problem with an MONO application, I\'m trying to compile the project (with MonoDevelop) so as to load the library run mscorlib.dll 4.0 instead of version 2.0.

Answer 1

Right-click the project -> open the Build/General page and make sure Target Framework is Mono / .NET 4.0:

Answer 2

Finaly I found a solution for this problem:

https://bugs.launchpad.net/ubuntu/+source/gtk-sharp2/+bug/884035/comments/14

Simply modify the "app.config" file and change the content for this:

<?xml version="1.0"?>
<configuration>
<startup><supportedRuntime version="v4.0"/></startup></configuration>

Recompile the proyect and now work fine.