Can I call class as string param in other class?

Question

Suppose 

public class A

{

int a=5;

void  sum()

{int a=5,b=5,c;

c=a+b; 

} 

} 

 

public class B 

{  

  int b=6;

void getmethod(string A,int a)

{

//code 

}  

} 

So How can i do it?