C# from base of derived class get type code example

Example: how to get derived class from base class C#

class Base {
	[...]
}

class Derived : Base {
	[...]
}

/* if an instance of the base class is derived you will be able to
cast that instance to it's derrived class, as such: */

Base baseInstance = new Derived();
Derived derivedFromInstance = (Derived)baseInstance;