How do I change the .Net Framework from version 3.5 to version 4.0

Question

I have created a class library in .NET Framework 3.5. Now I want to change the .NET Framework Version to 4.0.

How can I do this?

Answer 1

In Visual Studio:

1. Right-click on your project
2. Select Properties
3. Select the Application tab
4. Change the Target Framework to the desired framework

If you are not seeing .NET Framework 4 as an option there, ensure you have it installed.

EDIT

I don't think this is what you're asking, but for completeness, one can also point an existing DLL to a later version of the .NET Framework without recompiling using Binding Redirects.