It's going to depend on quite a few things: it could be any one of them.
First, I assume that the school class and the student class are both in the same project? If not, then it is a relatively simple problem.
Why would you instantiate a school from a student? A school would logically exist independently of the particular student, because it would have many students - rather than a student having many schools.
When you instantiate the school, you are presumably using the instance to access the method (or you wouldn't have mentioned it):
School s = new School ();
Console.WriteLine(s.GetName());
There are two things to check here, both related to the method definition:
1) Is the method declared as
public? If it isn't, and Student isn't derived from School, then you cannot access it from outside.
2) Is the method declared as
static? If it is, then you can't access it from the instance, you have to use the class name instead:
Console.WriteLine(School.GetName());
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