Do I have to pay a fee to develop or deploy a .NET application?

Question

I have heard that .NET is not free and that I have to pay Microsoft if I develop a .NET application. Is this true? If so:

1. What do I have to pay?

Answer 1

I want to emphasize here, fee of VS or other development tools is not the fee of .net framework. sdk, libraries so the .net framework are all free.