Obfuscation a particular folder in a project

Question

 Hi,

The client gave Purchase module to us and remaining to some other. This is an windows application. How can I able to Obfuscate the windows form and its source without publish or even compile.
We want the code not to be readable.(i.e. the cs file code and the code in the InitializeComponent(); for the design)

public partial class Purchase : Form
    {
        public Purchase()
        {
            InitializeComponent();
        }
    }
Thanks,
Babu Kumarasamy.