Access public class member from other class

Question

Suppose, i have 2 classes public class A { public string s1; } public class B { } Is there anyway to use string 's1' from class A in class B ? My conditions are: - " string s1 " is non-static variable. ( just public ) - In class B, i will not use " A a = new A(); a.s1 = "hello"; " to access string s1. (not new it).