I'm not sure I understand what do you mean by "I need to export it to c# code and use it in my code".
All test steps are actually methods in .Net and If you need to see the code of a desired step, you can right-click on the step and select "Customize step in code". You can also add steps directly in code if you chose "Script Step" from the Add menu.
You should be able to see the entire source code if you click on the "View Class" button. It's supposed to toggle between viewing the code for just one coded step and viewing the entire source code file with all the coded steps.
The Pages class is defined in the Pages.g.cs(or .vb) file. We automatically generate this file every time you build your project
The Manager class is part of ArtOfTest.WebAii.Core namespace. It manages the life spans and instances of all browser objects in the framework. It also manages the communication pipeline between the framework and all browsers.
Active Browser is actually a property(not a class). And this property is a member of the Manager class. It gets the last browser instance launched.
I hope this answers your question!
the Telerik team