Access Modifiers

Access modifiers
public: The type or process quite a little be accessed by any other code in the same assembly or another assembly that references it.
privy: The type or member can be accessed altogether by code in the same contour or struct.
protected: The type or member can be accessed only by code in the same configuration or struct, or in a word form that is derived from that class.
privileged:The type or member can be accessed by any code in the same assembly, exactly not from another assembly.
protected internal: The type or member can be accessed by any code in the assembly in which it is declared, or from within a derived class in another assembly. Access from another assembly moldiness take place within a class firmness that derives from the class in which the protected internal element is declared, and it must take place through an instance of the derived class type.

upcountry is the default if no access modifier is specified for classes
offstage is the default for variables
Can you keep your class from being ancestral by another class?
Yes. The keyword sealed will prevent the class from being inherited.





Can you allow a class to be inherited, but prevent the rule from being over-ridden?
Yes. adept leave the class public and make the method sealed.
What does the keyword virtual(prenominal) declare for a method or property?
The method or property can be overridden.

line vs String Builder
String: Immutable means you cant change the current data, but if you perform some operation on that data, a red-hot copy is created
StringBuilder is more efficient in cases where there is a large amount of string manipulation. Strings are immutable, so each time a string is changed, a overbold instance in memory is created.
string returnNumber = ;
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