How to upgrade .NET Framework?
First of all you need to install desired framework version on both development and client machines. Development machine is an environment where you code and build your project. It requires .NET Framework Developer Pack. Client machine is an environment where your application is used. It requires lighter package .NET Framework Runtime. Both types can be downloaded from Microsoft website.
When system is ready the next step is to change your project to target another framework version. Below you can see two methods how to do it. Continue reading .NET Framework upgrade