Questions "compile"

1. What is the Main method?
2. What is source code, bytecode, and executable code?
3. How can you compile a C#-program which is wholly contained in one file, say hello.cs, into an executable bytecode?
4. How do you run the resulting executable code with the mono runtime-system?
5. How can you compile the C# source code in the file cmath.cs into a bytecode library cmath.dll?
6. How can you link a bytecode library, say cmath.dll, when compiling your file with the Main method, say main.cs?