Szathmáry László honlapja @ DEIK

Class access modifiers

static class: the class cannot have instance variables or methods. They must all be static. The compiler will check this for you.

static constructor: initialize static class variables

public class Something
{
public static int sharedNumber; // class variable, belongs to the class

static Something()
{
Something.sharedNumber = 3;
}
}

Of course, here we could have simply written public static int sharedNumber = 3;

internal: it can be used inside the current project or assembly. An assembly is usually a single project in a compiled form (a single EXE or DLL).

class Book
{
...
}

For a class the default access modifier is inernal, thus the code above is equivalent to this:

internal class Book
{
...
}

If you want to use the class outside of the original project, then make it public:

public class Book
{
...
}

20180407c

Class access modifiers