To become an Asp.net programmer do you need to be a C# programmer?

To be employable as ASP.NET programmer do you need to be a very good C# programmer? Or just know the basics understanding that asp.net provides most of what you need? thanks.

To become an Asp.net programmer do you need to be a C# programmer?
You need to know programming - just knowing the language isn't enough. But you can be a top-level ASP.Net programmer without knowing any C# at all. (Could Shakespeare write in Spanish? Could Cervantes write in English?) I don't even ask prospective hires about C# (or ASP) - we're a php house on the web side.