Every class member has an accessibility level that determines where the member will be visible. There are six of them available in C#: public, protected, internal, protected internal, private, and private protected, the last of which was added in C# 7.2. The default access level for members of a class is private.
Private Access
All members regardless of access level are accessible in the class in which they are declared, the defining class. This is the only place where a private member can be accessed.
public class MyBase
{
// Unrestricted access
public int myPublic;
// Defining assembly or ...
