C# code encryption

Hi,

I'm looking for a method to encrypt a C# code inside a project, because I need to deploy our project in our customer server.

Currently we are using a Web Forms instead of Web Site, so when we publish all the c# will be converted to a dll file. I have a difficulty with this method, because when I need to fix some file only I need to redeploy all.

Is there any method to patch some files only or any other encryption method that I can use?

Thanks,

Tan