How to translate from one number system to another in C#?

Question

C++ / C#

Interested in the translation from the binary system to the decimal system and vice versa, as well as from the 16-ary and 8-ary and, if possible, 3-ary and 9-ary.

Answer 1

There is a method

Convert.ToString();

A that takes two parameters.
The first is a signed integer, the second is the base of the calculus.