ACCESS MODIFIERS

c# has some access modifiers below:

public:class or member can be accessed by no restrictions 

private:members can only be accessed within the class itself

internal:class or member can only be accessed within the assembly,not others.

protected:members can only be accessed by derived class(or within the class of course), not others non-derived class.

protected internal: members can only be accessed by derived class, OR, in the same assembly.

NOTE:

1. not all access modifiers can be used on class,that‘s why there‘s underline on "class or member" and "members". it‘s nonsense to use private,protected,protected internal on a class. This may make mistake easily.
2. no access modifier allowed on namespace,but public is implicitly.
3. internal is default to a class
4. no access modifier allowed on a interface but public is implicitly.
5. private is default to members.

Modifiers and Static

Can not use override,virtual or abstract on a static member, cause these are for instance of inheriting

Size of basic types

Easy mistakes in c#