Easy mistakes in c#

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:

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.

no access modifier allowed on namespace,but public is implicitly.

internal is default to a class

no access modifier allowed on a interface but public is implicitly.

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

type   size(byte)   size(bit)   Range  
 char    2    16      
     char          
     char          
     char          

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